Refactor away from PDF language

[Sparks29032]

Closes #236

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.92%. Comparing base (de41950) to head (d928a81).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #261   +/-   ##
=======================================
  Coverage   99.92%   99.92%           
=======================================
  Files          24       24           
  Lines        1398     1398           
=======================================
  Hits         1397     1397           
  Misses          1        1           

Files with missing lines	Coverage Δ
tests/test_morphapp.py	100.00% <100.00%> (ø)
tests/test_morphchain.py	100.00% <100.00%> (ø)
tests/test_morphio.py	100.00% <100.00%> (ø)
tests/test_morphrgrid.py	100.00% <100.00%> (ø)
tests/test_refine.py	100.00% <ø> (ø)

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[sbillinge]

@Sparks29032 this is ready for merge but unfortunately it is conflicted with the earlier merge i did of the citation.cff file

[Sparks29032]

@sbillinge Should be fixed