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 66.27%. Comparing base (7d93c7a) to head (929a82f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #678   +/-   ##
=======================================
  Coverage   66.27%   66.27%           
=======================================
  Files          22       22           
  Lines        2150     2150           
=======================================
  Hits         1425     1425           
  Misses        591      591           
  Partials      134      134           

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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.