feat: remove hotjar

[MaxFrank13]

Hotjar is a third party service and we are moving towards removing support for third party services with the switch to frontend-base. More details in the corresponding issue openedx/public-engineering#413.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.76%. Comparing base (0a50937) to head (67dee2c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #717      +/-   ##
==========================================
+ Coverage   97.54%   97.76%   +0.22%     
==========================================
  Files         148      148              
  Lines        1302     1298       -4     
  Branches      225      224       -1     
==========================================
- Hits         1270     1269       -1     
+ Misses         31       28       -3     
  Partials        1        1              

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