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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

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

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