Move everything to markdown.

[tobiasraabe]

Changes

Fixes #17.

[codecov]

Codecov Report

Merging #18 (8bdb63b) into main (e63c617) will decrease coverage by 1.55%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   80.89%   79.34%   -1.56%     
==========================================
  Files           4        4              
  Lines          89       92       +3     
==========================================
+ Hits           72       73       +1     
- Misses         17       19       +2     

Flag	Coverage Δ
end_to_end	79.34% <66.66%> (-1.56%)	⬇️

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Impacted Files	Coverage Δ
{{cookiecutter.project_slug}}/docs/source/conf.py	29.16% <50.00%> (+0.59%)	⬆️
tests/test_cookie.py	100.00% <100.00%> (ø)

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