Initial editorial tweaks for JOSS paper

[warrickball]

This is an initial set of editorial tweaks to the JOSS paper following the successful review. Most of these are to the citation style and bits of capitalisation. If you're happy with the changes and merge them (or selectively apply some yourself), I'll launch a test run of our publication pipeline as soon as the archive is created and the relevant metadata set. There might be another set of changes if the publication pipeline doesn't parse the metadata correctly but it looks okay to me so far.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.06%. Comparing base (710b65c) to head (2ba1e65).
⚠️ Report is 124 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1169      +/-   ##
==========================================
- Coverage   85.25%   85.06%   -0.20%     
==========================================
  Files          69       69              
  Lines        3521     3528       +7     
==========================================
- Hits         3002     3001       -1     
- Misses        519      527       +8     

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