Use source code for demo directly in demo

[edrogers]

Looking through the source code of the demo deck, I found the unused variable edit_function_src in the bindings slide:

    edit_function_src = dedent("".join(inspect.getsourcelines(edit_this_file)[0]))

I suspect this was originally intended to be a way to display some of the module's source directly in the a code-block on the slide. This seems like a good idea, so I tried following through on it. I think the result de-duplicates the source code without introducing too much messiness.

The slide deck produced is ultimately unchanged, so it's just a style preference. Let me know if you think it's worth it.

Tasks

• Updated changelog.
• Updated documentation.

[JoshKarpel]

Definitely worth it! As you guessed, that line was a leftover from my attempt to do pretty much the same thing. I got flummoxed by the indentation, which it looks like you've solved here. Will take a closer look later!

[codecov]

Codecov Report

Base: 82.5% // Head: 82.5% // Decreases project coverage by -0.0% ⚠️

Coverage data is based on head (e619c28) compared to base (7a55940).
Patch coverage: 100.0% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #194     +/-   ##
=======================================
- Coverage   82.5%   82.5%   -0.1%     
=======================================
  Files         33      33             
  Lines        843     842      -1     
  Branches      96      96             
=======================================
- Hits         696     695      -1     
  Misses       147     147             

Impacted Files	Coverage Δ
spiel/deck.py	93.5% <100.0%> (-0.3%)	⬇️

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[JoshKarpel]

@edrogers I pushed up some new commits to your branch - I took inspiration from your approach on the indentation, but stitched things together with inspect.getsourcelines to avoid the start/stop comments. Let me know what you think!