Add edit button to wiki sidebar and footer

[n194]

This PR adds an edit button to wiki sidebars and footer

Closes #16655

[silverwind]

I think it should either be with a transparent background or with border and background (e.g. replace label with button class).

[n194]

@silverwind I tried it with the button class but there were some alignment/overflow issues. I can make it transparent, is there a class that I can use to revert the blue color of a link?

[silverwind]

Yes, add muted class to the <a>.

[n194]

Fixed

[codecov-commenter]

Codecov Report

Merging #16719 (213a856) into main (9f0c8f9) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #16719      +/-   ##
==========================================
- Coverage   45.36%   45.35%   -0.01%     
==========================================
  Files         760      760              
  Lines       85482    85482              
==========================================
- Hits        38775    38774       -1     
- Misses      40424    40426       +2     
+ Partials     6283     6282       -1     

Impacted Files	Coverage Δ
services/pull/temp_repo.go	30.76% <0.00%> (-3.85%)	⬇️
services/pull/check.go	25.51% <0.00%> (-2.76%)	⬇️
services/pull/patch.go	54.23% <0.00%> (-1.70%)	⬇️
routers/web/repo/view.go	40.95% <0.00%> (-0.58%)	⬇️
services/pull/pull.go	41.78% <0.00%> (ø)
services/gitdiff/gitdiff.go	74.23% <0.00%> (+0.97%)	⬆️
modules/log/event.go	62.50% <0.00%> (+1.85%)	⬆️
modules/charset/charset.go	73.73% <0.00%> (+2.02%)	⬆️

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[silverwind]

BTW we really need to add some UI later to create sidebar and footer.

Edit, see: #16655