docs: Add ability to toggle dark-mode

[kazysgurskas]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.64%. Comparing base (edb67c6) to head (fefa725).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #678   +/-   ##
=======================================
  Coverage   74.64%   74.64%           
=======================================
  Files          31       31           
  Lines        3913     3913           
=======================================
  Hits         2921     2921           
  Misses        856      856           
  Partials      136      136           

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[jannfis]

Nice! Thanks for this, and I'm really sorry for the long delay in reviewing this.

Would you be able to fix the DCO check by signing off your commit? I'd appreciate that a lot, and then I will merge this PR.

Fixing the DCO in this PR should be as simple as running

git commit --amend -s

in your local PR branch and then force-pushing.