🐛 FIX: Fix to stop stripping of first line in MyST content

[foster999]

See #163

[codecov]

Codecov Report

Merging #165 (a97c4d8) into master (f2b4714) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master     #165   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
=======================================
  Files           2        2           
  Lines         219      219           
=======================================
  Hits          203      203           
  Misses         16       16           

Flag	Coverage Δ
pytests	92.69% <50.00%> (ø)

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Impacted Files	Coverage Δ
sphinx_tabs/tabs.py	92.62% <50.00%> (ø)

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