Minor fixes in doc webpage

[hynekkar]

• Fixed jekyll base url to prevent 404 errors
• Fixed centering in the footer

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.61%. Comparing base (7f6d32c) to head (70bee54).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #235      +/-   ##
==========================================
+ Coverage   40.59%   40.61%   +0.01%     
==========================================
  Files         104      104              
  Lines       10120    10120              
  Branches     1492     1492              
==========================================
+ Hits         4108     4110       +2     
+ Misses       5147     5145       -2     
  Partials      865      865              

Flag	Coverage Δ
tests	40.61% <ø> (+0.01%)	⬆️

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