v0.1.2

- Improve the CSS
- Friendlier error messages
- Checkbox behavior fixes such as unsetting indeterminate when
  deselecting courses, un-disabling already chosen choices
- Improve accessibility as Lighthouse reports it
- Fix the Makefile's lacking source specifiers
- Fix a command collision (N was ambiguous)
- Remove the ID column in the course table because nobody cares
- Add a benchmarking/testing utility and allow fake authentication
- Fix potential database integer overflows
- Documentation updates
- Basic session collision management and context cancellations
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