Documentation: update installconfig

[abhinavdahiya]

also drops previous work as it confuses people and serves little purpose.

/cc @yifan-gu @wking
/assign @wking @yifan-gu

NOTE: switch on hide whitespaces changes for better visibility.

[abhinavdahiya]

A lot of PRs (ex: this) try to sync previous work of this doc, which was not its purpose. @crawford suggested we don't need this section.

[wking]

Needs a rebase with #188 landed, but otherwise looks good to me :).

[abhinavdahiya]

@wking rebased against master. PTAL.

[wking]

/lgtm

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