docs: septa timetable blog post

[machow]

This PR contains a draft blog post on creating a beautiful timetable, based on some Septa Transit data

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.61%. Comparing base (85d25f6) to head (c0994f4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #636      +/-   ##
==========================================
+ Coverage   91.58%   91.61%   +0.03%     
==========================================
  Files          47       47              
  Lines        5752     5773      +21     
==========================================
+ Hits         5268     5289      +21     
  Misses        484      484              

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