Re-enable "Edit on Github" because it got fixed

[benjaoming]

Summary

Disabled in #2850
Fixed upstream in readthedocs/readthedocs.org#3203

Has to be sync'ed to develop after.

Reviewer guidance

IMO we should re-introduce it on User Docs, too, until a feedback button is created to replace it.

References

n/a

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Contributor Checklist

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• Contributor has fully tested the PR manually
• Screenshots of any front-end changes are in the PR description
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')

Reviewer Checklist

• Automated test coverage is satisfactory
• Reviewer has fully tested the PR manually
• PR has been tested for accessibility regressions
• External dependencies files were updated (yarn and pip)
• Documentation is updated
• Link to diff of internal dependency change is included
• CHANGELOG.rst is updated for high-level changes
• Contributor is in AUTHORS.rst

[codecov]

Codecov Report

Merging #2999 into release-v0.7.x will decrease coverage by 0.15%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           release-v0.7.x    #2999      +/-   ##
==================================================
- Coverage           76.27%   76.11%   -0.16%     
==================================================
  Files                 187      187              
  Lines                7624     7269     -355     
  Branches              983      916      -67     
==================================================
- Hits                 5815     5533     -282     
+ Misses               1624     1557      -67     
+ Partials              185      179       -6

Impacted Files	Coverage Δ
kolibri/plugins/setup_wizard/middleware.py	87.5% <0%> (-8.34%)	⬇️
kolibri/core/exams/serializers.py	89.09% <0%> (-4.66%)	⬇️
kolibri/plugins/coach/api.py	86.15% <0%> (-3.39%)	⬇️
kolibri/auth/api.py	90.86% <0%> (-3.38%)	⬇️
kolibri/logger/api.py	96.52% <0%> (-2.19%)	⬇️
kolibri/core/exams/api.py	78.72% <0%> (-1.93%)	⬇️
kolibri/content/api.py	71.17% <0%> (-0.93%)	⬇️
kolibri/utils/server.py	50.36% <0%> (+1.18%)	⬆️
frontend_build/src/prettier-frontend.js	12.85% <0%> (+1.51%)	⬆️
kolibri/deployment/default/urls.py	61.53% <0%> (+8.2%)	⬆️

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[radinamatic]

LGTM! 👍

[indirectlylit]

have we been able to confirm that the link actually works?

[indirectlylit]

(I'm not sure how to test this without merging in)

[benjaoming]

@indirectlylit yes it works, see upstream

[indirectlylit]

very nice