Add donate button

[benoit74]

Fix #27

Nota: I'm not using the donorbox JS because it integrates badly with existing UI / prevent natural translations / prevent opening link in new tab/window (which is mostly mandatory in zimit frontend).

Screen.Recording.2024-10-29.at.16.04.16.mov

@Popolechien comments welcomed on UX side ; am I using the proper link ? https://kiwix.org/en/get-involved/#donate

[benoit74]

PS: I forgot to preview it in the screenshot, but obviously when switching to RTL languages the button is on the left of the screen

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.35%. Comparing base (00390cf) to head (0750d24).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   46.35%   46.35%           
=======================================
  Files          10       10           
  Lines         384      384           
  Branches       43       43           
=======================================
  Hits          178      178           
  Misses        205      205           
  Partials        1        1           

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[Popolechien]

Link is correct. Thank you.

[rgaudin]

LGTM