Update docs

[nwlandry]

Updated the following:

• The "Using XGI" page
• Added missing documentation for the Encapsulation DAG conversion module
• Added links to the JOSS paper
• Updated the list for other resources and organized by language

[nwlandry]

@tlarock --- I think that I've fixed the missing docs for the Encapsulation DAG. @mgao97 --- let me know if there's anything you would like me to change in the reference to EasyGraph in the README.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.16%. Comparing base (369a10a) to head (a6f5bb7).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #529      +/-   ##
==========================================
- Coverage   92.19%   92.16%   -0.03%     
==========================================
  Files          60       60              
  Lines        4392     4417      +25     
==========================================
+ Hits         4049     4071      +22     
- Misses        343      346       +3     

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[nwlandry]

Fixes #528.