Upgrade bootstrap version

[ahasverus]

Minor changes:

• Increase Bootstrap to the version 5 to add a favicon to the website
• Delete some badges in the README
• Delete GH action to auto-render Rmarkdown files

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3635f8d) 100.00% compared to head (f57bac2) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #100   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           36        36           
  Lines         1381      1381           
=========================================
  Hits          1381      1381           

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