Refresh: Add CTA pencil banner

[reemhamz]

One-line summary

This pencil banner, which is to be added to all the pages that'll be using the new navigation (#14966), will be replacing the nav CTAs we currently have on www.mozilla.org.

This is currently a WIP 'til the new nav PR gets merged. The placements of files and imports will be updated and refined then, as well. For now, I just did what I could to get the banner showing, which will hopefully reduce whatever integration we need to get done until the new nav descends upon us ✨

Note

Copy for the Firefox pencil banner is currently just placeholder

Issue / Bugzilla link

#15095

Testing

Make sure your .env file has the following:

SWITCH_M24_HOME=True
SWITCH_M24_ABOUT=True

http://localhost:8000/en-US/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.88%. Comparing base (c7bf500) to head (4d86113).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15133      +/-   ##
==========================================
+ Coverage   77.83%   77.88%   +0.04%     
==========================================
  Files         162      162              
  Lines        8459     8473      +14     
==========================================
+ Hits         6584     6599      +15     
+ Misses       1875     1874       -1     

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[reemhamz]

Converting this back to a draft since work on this is paused