Adds a links sidebar

[arokem]

For uniform look across the websites.

Also, adds logo that was missing in previous PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.66%. Comparing base (abe6709) to head (d1dec02).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   87.85%   88.66%   +0.81%     
==========================================
  Files          15       15              
  Lines        7269     7765     +496     
  Branches      997     1044      +47     
==========================================
+ Hits         6386     6885     +499     
+ Misses        883      880       -3     

Flag	Coverage Δ
linux	87.85% <ø> (ø)
macos	88.50% <ø> (?)

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