✨ NEW: Create ToC from file structure

[chrisjsewell]

This is a re-working of jupyter-book toc (by @choldgraf) but with improvements such as:

• configurable index name and suffixes
• using "natural sort order" for files/folders
• using fnmatch for matching files/folders to skip
• better testing

[codecov]

Codecov Report

Merging #14 (39d9ed2) into main (6fdc3af) will increase coverage by 0.50%.
The diff coverage is 91.95%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   89.81%   90.32%   +0.50%     
==========================================
  Files           5        5              
  Lines         383      465      +82     
==========================================
+ Hits          344      420      +76     
- Misses         39       45       +6     

Flag	Coverage Δ
pytests	90.32% <91.95%> (+0.50%)	⬆️

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Impacted Files	Coverage Δ
sphinx_external_toc/api.py	89.26% <66.66%> (+0.12%)	⬆️
sphinx_external_toc/tools.py	91.48% <91.80%> (+0.06%)	⬆️
sphinx_external_toc/cli.py	95.12% <95.65%> (+0.12%)	⬆️

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