[BD-46] feat: added Edit this page CTA to non-component pages

[PKulkoRaccoonGang]

Description

• added Edit this page CTA to non-component pages;
• some refactoring.

Issue: #2625

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (322c80d) 91.90% compared to head (2dcec87) 91.83%.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2667      +/-   ##
==========================================
- Coverage   91.90%   91.83%   -0.08%     
==========================================
  Files         235      235              
  Lines        4310     4224      -86     
  Branches     1044     1024      -20     
==========================================
- Hits         3961     3879      -82     
+ Misses        345      341       -4     
  Partials        4        4              

see 8 files with indirect coverage changes

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[edx-semantic-release]

🎉 This PR is included in version 22.0.0-alpha.8 🎉

The release is available on:

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• GitHub release

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[edx-semantic-release]

🎉 This PR is included in version 21.4.0 🎉

The release is available on:

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• GitHub release

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