fix: render ref links in TOC.

[lemon24]

Fixes #426.

[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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.68%. Comparing base (c856325) to head (a0a0148).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #427   +/-   ##
=======================================
  Coverage   91.68%   91.68%           
=======================================
  Files          34       34           
  Lines        2633     2633           
  Branches      447      447           
=======================================
  Hits         2414     2414           
  Misses        147      147           
  Partials       72       72           

Flag	Coverage Δ
unittests	91.64% <100.00%> (ø)

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[lepture]

Thanks