Add a fonts loader path and have fonts use that for accessing their data

[dpvc]

This PR creates a fonts loader path and has the font components use that to access their data rather than using a direct reference to jesdelivr.net. That way, if a site wants to host their own fonts, it is easy to redirect to the site location rather than having to give a path for every font (e.g., the mhchem, bbm, dsfont, etc. fonts). This also puts the reference to jesdelivr in only one place, which is helpful.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.66%. Comparing base (27c47f3) to head (34355d7).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1373      +/-   ##
===========================================
- Coverage    86.66%   86.66%   -0.01%     
===========================================
  Files          338      338              
  Lines        84384    84381       -3     
  Branches      4779     4778       -1     
===========================================
- Hits         73131    73128       -3     
+ Misses       11253    11230      -23     
- Partials         0       23      +23     

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