Style onboarding email

[ben-z]

Style changes

This PR adds a logo to the email:

Perf changes

Removes the use of tailwind: not using tailwind cuts rendering time by about half (tested in infra-config using time python3 emails/onboarding/get-config.py generate-emails --output-path /tmp/out.json. Time went from 18 seconds to 9 seconds on 64 cores).

Here's the output of perf.sh before and after:

# before
ben@thor-slurm1 ~/Projects/watcloud-emails main ?2 ❯ ./scripts/perf.sh
Generating onboarding 1
Generating onboarding 2
Generating onboarding 3
Generating onboarding 4
Generating onboarding 5
Generating onboarding 6
Generating onboarding 7
Generating onboarding 8
Generating onboarding 9
Generating onboarding 10

real    0m8.250s
user    0m8.533s
sys     0m1.660s


Generating onboarding bulk with size 10

real    0m3.285s
user    0m4.328s
sys     0m0.554s


# after
ben@thor-slurm1 ~/Projects/watcloud-emails benz/onboarding-styles ?2 ❯ ./scripts/perf.sh
Generating onboarding 1
Generating onboarding 2
Generating onboarding 3
Generating onboarding 4
Generating onboarding 5
Generating onboarding 6
Generating onboarding 7
Generating onboarding 8
Generating onboarding 9
Generating onboarding 10

real    0m5.597s
user    0m5.285s
sys     0m1.025s


Generating onboarding bulk with size 10

real    0m0.637s
user    0m0.602s
sys     0m0.147s

We are seeing significant speedup when using the bulk command. The running time increases much slower with size:

Generating onboarding bulk with size 100

real    0m0.854s
user    0m1.099s
sys     0m0.134s