♻️ REFACTOR: Replace attrs with dataclasses

[chrisjsewell]

Removes the external dependency

[codecov]

Codecov Report

Merging #76 (6cd6f05) into main (bbf855a) will decrease coverage by 0.11%.
The diff coverage is 92.92%.

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
- Coverage   91.07%   90.95%   -0.12%     
==========================================
  Files           6        7       +1     
  Lines         661      730      +69     
==========================================
+ Hits          602      664      +62     
- Misses         59       66       +7     

Flag	Coverage Δ
pytests	90.95% <92.92%> (-0.12%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sphinx_external_toc/_compat.py	87.71% <87.71%> (ø)
sphinx_external_toc/api.py	94.05% <100.00%> (+0.72%)	⬆️
sphinx_external_toc/parsing.py	92.13% <100.00%> (+0.04%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bbf855a...6cd6f05. Read the comment docs.