docs: override default vitepress brand colors

[matthewmayer]

fix #2626

Originally I was going to make it green but i think red looks quite nice (took the hue from the Faker logo, the saturation and lightness values are from the default Vitepress theme).

()

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b1987ef) 99.57% compared to head (fad558c) 99.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2632      +/-   ##
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- Coverage   99.57%   99.57%   -0.01%     
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  Files        2807     2807              
  Lines      250489   250489              
  Branches     1154     1152       -2     
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- Hits       249430   249420      -10     
- Misses       1031     1041      +10     
  Partials       28       28              

see 1 file with indirect coverage changes

[ST-DDT]

The faker title looks quite pink on the dark background, and the difference to the button is very visible.

[matthewmayer]

I think maybe decide first in the meeting if you prefer red green or blue in general, and then I can tweak the colours to make it look nice everywhere.

[ST-DDT]

Team Decision

• We decided to stick to the green design for now.
• We can rethink our "corporate"/brand design later, currently we are too busy for that and it needs to be done for more than the website.

[matthewmayer]

Back to a green design similar to the old theme