feat: Support footnotes that start on the next line.

[kylechui]

When footnotes get too long, prettier will format them to begin on the next line, with an indentation level of 4. This can be reproduced by formatting with prettier --prose-wrap=always. The current parser does not accurately parse this use case. Should resolve #373

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.56%. Comparing base (9f4ff6f) to head (0516c9e).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #423   +/-   ##
=======================================
  Coverage   91.56%   91.56%           
=======================================
  Files          34       34           
  Lines        2631     2633    +2     
  Branches      448      447    -1     
=======================================
+ Hits         2409     2411    +2     
  Misses        147      147           
  Partials       75       75           

Flag	Coverage Δ
unittests	91.53% <100.00%> (+<0.01%)	⬆️

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