Update the homepage dark color

[obulat]

Fixes

Fixes #4936 by @fcoveram

Description

This PR changes the color of the homepage in dark mode to match the mockups. This also changes the color of the generic error page, you can see the updated version in the changed snapshots.

Testing Instructions

Run the app and go to http://localhost:8443
Change the app theme to dark
Check that the colors are correct, or suggest improvements.
Also check the error page by going to http://localhost:8443/non-existent-page. Note that this page's design will need to be updated, but in this PR only the colors are updated to match the home page.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

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Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
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    in the file; or

(c) The contribution was provided directly to me by some other
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    this project or the open source license(s) involved.

[zackkrida]

Barring any design changes from @fcoveram, I think this looks great!

[zackkrida]

@obulat looks like potential flake in an audio test

[obulat]

@obulat looks like potential flake in an audio test

It's #4981. Working on it

[github-actions]

Latest k6 run output¹

$     ✓ status was 200

     checks.........................: 100.00% ✓ 8000      ✗ 0   
     data_received..................: 1.8 GB  8.7 MB/s
     data_sent......................: 1.0 MB  5.0 kB/s
     http_req_blocked...............: avg=9.7µs    min=1.18µs  med=2.27µs   max=5.38ms  p(90)=3.37µs   p(95)=3.63µs  
     http_req_connecting............: avg=6.89µs   min=0s      med=0s       max=5.3ms   p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=547.63ms min=41.93ms med=490.81ms max=2.34s   p(90)=1.03s    p(95)=1.12s   
       { expected_response:true }...: avg=547.63ms min=41.93ms med=490.81ms max=2.34s   p(90)=1.03s    p(95)=1.12s   
   ✓ http_req_failed................: 0.00%   ✓ 0         ✗ 8000
     http_req_receiving.............: avg=132.8µs  min=39.18µs med=106.53µs max=12.97ms p(90)=176.24µs p(95)=217.27µs
     http_req_sending...............: avg=21.21µs  min=6.34µs  med=18.9µs   max=2.98ms  p(90)=25.69µs  p(95)=31.45µs 
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s       max=0s      p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=547.48ms min=41.85ms med=490.7ms  max=2.34s   p(90)=1.03s    p(95)=1.12s   
     http_reqs......................: 8000    37.930302/s
     iteration_duration.............: avg=3.65s    min=1.16s   med=3s       max=12.16s  p(90)=7.85s    p(95)=8.34s   
     iterations.....................: 1200    5.689545/s
     vus............................: 2       min=2       max=30
     vus_max........................: 30      min=30      max=30

Footnotes

1. This comment will automatically update with new output each time k6 runs for this PR ↩