feat: format XGI-DATA numbers

[doabell]

Due to an upstream change in XGI-DATA (xgi-org/xgi-data#23), the XGI-DATA page now shows numbers without comma separators.

This PR adds the commas back.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.16%. Comparing base (caf534b) to head (735fe4a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #532   +/-   ##
=======================================
  Coverage   92.16%   92.16%           
=======================================
  Files          60       60           
  Lines        4417     4417           
=======================================
  Hits         4071     4071           
  Misses        346      346           

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[doabell]

@nwlandry Would you be able to take a quick look? Thanks!

Preview works properly on:

• Edge Windows
• Firefox Windows
• Safari iOS
• Firefox Android
• Chrome Android

Properly changes commas to dots with a de-DE locale on Firefox Windows.

[nwlandry]

Nice work, @doabell! Looks great.