Catch un-renderable slide content at runtime

[JoshKarpel]

Tasks

• Updated changelog.
• Updated documentation.

[codecov]

Codecov Report

Base: 82.9% // Head: 94.1% // Increases project coverage by +11.1% 🎉

Coverage data is based on head (0af7ad3) compared to base (de3a57d).
Patch coverage: 98.8% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #202      +/-   ##
========================================
+ Coverage   82.9%   94.1%   +11.1%     
========================================
  Files         33      35       +2     
  Lines        833     920      +87     
  Branches      94     110      +16     
========================================
+ Hits         691     866     +175     
+ Misses       142      47      -95     
- Partials       0       7       +7     

Impacted Files	Coverage Δ
spiel/app.py	75.8% <50.0%> (+14.7%)	⬆️
spiel/widgets/slide.py	94.2% <100.0%> (+36.2%)	⬆️
spiel/widgets/widget.py	100.0% <100.0%> (+33.3%)	⬆️
tests/test_app.py	100.0% <100.0%> (ø)
tests/test_slide_widget.py	100.0% <100.0%> (ø)
spiel/screens/slide.py	73.9% <0.0%> (+17.3%)	⬆️
spiel/screens/deck.py	100.0% <0.0%> (+18.1%)	⬆️
spiel/screens/help.py	100.0% <0.0%> (+26.6%)	⬆️
... and 4 more

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