docs: Update "Advanced Setup" section

[bmorelli25]

Summary

This PR...

• renames the "Set up" section to "Advanced setup"
• Adds links to the Fleet and Agent guide where applicable.
• Deletes one of the duplicated "Tune Elasticsearch" pages
• Moves "Tune APM Server into the "Advanced setup" topic
• Adds Agent content to the "Tune..." documentation where applicable
• Removes Keystore documentation

PREVIEW ME: https://apm-server_10791.docs-preview.app.elstc.co/guide/en/apm/guide/master/setting-up-and-running.html

[mergify]

This pull request does not have a backport label. Could you fix it @bmorelli25? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-7.x is the label to automatically backport to the 7.x branch.
• backport-7./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[ghost]

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• Start Time: 2023-05-16T15:40:51.905+0000

• Duration: 9 min 51 sec

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[mergify]

This pull request is now in conflicts. Could you fix it @bmorelli25? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b ft-advanced-setup upstream/ft-advanced-setup
git merge upstream/main
git push upstream ft-advanced-setup

[ghost]

📚 Go benchmark report

Diff with the main branch

goos: linux
goarch: amd64
pkg: github.com/elastic/apm-server/internal/agentcfg
cpu: 12th Gen Intel(R) Core(TM) i5-12500
                                  │ build/main/bench.out │              bench.out              │
                                  │        sec/op        │    sec/op     vs base               │
FetchAndAdd/FetchFromCache-12                41.17n ± 0%    46.21n ± 1%  +12.24% (p=0.002 n=6)
FetchAndAdd/FetchAndAddToCache-12            93.01n ± 3%   102.80n ± 9%  +10.53% (p=0.002 n=6)
geomean                                      61.88n         68.93n       +11.38%

                                  │ build/main/bench.out │             bench.out              │
                                  │         B/op         │    B/op     vs base                │
geomean                                                ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

                                  │ build/main/bench.out │             bench.out              │
                                  │      allocs/op       │ allocs/op   vs base                │
geomean                                                ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

pkg: github.com/elastic/apm-server/internal/beater/request
                                             │ build/main/bench.out │              bench.out              │
                                             │        sec/op        │    sec/op     vs base               │
ContextReset/X-Forwarded-For_ipv4-12                   937.1n ± 25%   666.1n ± 28%  -28.92% (p=0.026 n=6)
ContextResetContentEncoding/empty-12                   116.3n ±  2%   131.2n ±  1%  +12.81% (p=0.002 n=6)
ContextResetContentEncoding/uncompressed-12            140.7n ±  1%   157.5n ±  1%  +11.94% (p=0.002 n=6)
geomean                                                907.2n         922.5n         +1.68%

                                             │ build/main/bench.out │              bench.out               │
                                             │         B/op         │     B/op      vs base                │
geomean                                                           ²                 +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

                                             │ build/main/bench.out │             bench.out              │
                                             │      allocs/op       │ allocs/op   vs base                │
geomean                                                           ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

pkg: github.com/elastic/apm-server/internal/publish
             │ build/main/bench.out │          bench.out          │
             │        sec/op        │   sec/op    vs base         │

             │ build/main/bench.out │           bench.out            │
             │         B/op         │     B/op       vs base         │

             │ build/main/bench.out │           bench.out           │
             │      allocs/op       │  allocs/op    vs base         │

pkg: github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics
                 │ build/main/bench.out │           bench.out           │
                 │        sec/op        │    sec/op     vs base         │

                 │ build/main/bench.out │            bench.out            │
                 │         B/op         │     B/op      vs base           │
¹ all samples are equal

                 │ build/main/bench.out │           bench.out           │
                 │      allocs/op       │ allocs/op   vs base           │
¹ all samples are equal

pkg: github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics
                        │ build/main/bench.out │          bench.out           │
                        │        sec/op        │   sec/op     vs base         │

                        │ build/main/bench.out │           bench.out           │
                        │         B/op         │    B/op     vs base           │
¹ all samples are equal

                        │ build/main/bench.out │           bench.out           │
                        │      allocs/op       │ allocs/op   vs base           │
¹ all samples are equal

pkg: github.com/elastic/apm-server/x-pack/apm-server/sampling
               │ build/main/bench.out │             bench.out              │
               │        sec/op        │    sec/op     vs base              │
geomean                  628.4n         618.4n        -1.59%

               │ build/main/bench.out │              bench.out               │
               │         B/op         │     B/op      vs base                │
geomean                             ²                 -0.12%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

               │ build/main/bench.out │             bench.out              │
               │      allocs/op       │ allocs/op   vs base                │
geomean                             ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

pkg: github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage
                                            │ build/main/bench.out │               bench.out               │
                                            │        sec/op        │    sec/op      vs base                │
WriteTransaction/json_codec-12                        4.282µ ± 28%    9.893µ ± 90%  +131.04% (p=0.009 n=6)
WriteTransaction/json_codec_big_tx-12                 5.025µ ±  4%   11.060µ ± 45%  +120.09% (p=0.002 n=6)
ReadEvents/json_codec/0_events-12                     309.2n ± 10%    346.1n ± 14%   +11.92% (p=0.009 n=6)
ReadEvents/json_codec/1_events-12                     10.35µ ±  6%    11.04µ ±  4%    +6.67% (p=0.041 n=6)
ReadEvents/json_codec_big_tx/0_events-12              302.2n ±  5%    351.9n ±  7%   +16.45% (p=0.002 n=6)
ReadEvents/json_codec_big_tx/1_events-12              11.70µ ±  3%    12.81µ ±  8%    +9.48% (p=0.009 n=6)
ReadEvents/nop_codec/0_events-12                      309.4n ±  6%    356.5n ±  7%   +15.24% (p=0.002 n=6)
ReadEvents/nop_codec_big_tx/0_events-12               312.4n ±  7%    343.1n ±  7%    +9.84% (p=0.002 n=6)
ReadEvents/nop_codec_big_tx/1_events-12               1.990µ ±  9%    2.164µ ± 34%    +8.72% (p=0.041 n=6)
ReadEvents/nop_codec_big_tx/100_events-12             150.2µ ± 13%    141.1µ ± 11%    -6.06% (p=0.041 n=6)
IsTraceSampled/sampled-12                             70.09n ±  4%    77.87n ±  5%   +11.09% (p=0.002 n=6)
IsTraceSampled/unsampled-12                           71.52n ±  1%    79.57n ±  1%   +11.26% (p=0.002 n=6)
IsTraceSampled/unknown-12                             372.2n ±  6%    413.4n ±  6%   +11.05% (p=0.002 n=6)
geomean                                               29.37µ          30.78µ          +4.80%

                                            │ build/main/bench.out │               bench.out                │
                                            │         B/op         │      B/op       vs base                │
WriteTransaction/json_codec_big_tx-12                3.686Ki ±  0%    3.688Ki ±  0%  +0.04% (p=0.022 n=6)
ReadEvents/nop_codec_big_tx/1_events-12              3.194Ki ±  0%    3.191Ki ±  0%  -0.09% (p=0.009 n=6)
ReadEvents/nop_codec_big_tx/100_events-12            244.7Ki ±  0%    244.6Ki ±  0%  -0.05% (p=0.026 n=6)
geomean                                              31.42Ki          31.39Ki        -0.11%
¹ all samples are equal

                                            │ build/main/bench.out │              bench.out              │
                                            │      allocs/op       │  allocs/op   vs base                │
geomean                                                 144.7         144.7       -0.00%
¹ all samples are equal

report generated with https://pkg.go.dev/golang.org/x/perf/cmd/benchstat

[simitt]

Not blocking this PR, but let's have a conversation around how to document the commands for the apm-server binary before releasing the new docs (including why/if to remove the keystore docs);