Make calendar configurable, clean up <ExportOptions/>

[codetheweb]

Closes MIC-87, MIC-88.

[linear]

MIC-87 Add course subject:crse to generated calendar events
MIC-88 Add configurable alert to generated calendar events

[vercel]

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[codecov]

Codecov Report

Merging #26 (4e4cd19) into dev (f2f5cea) will decrease coverage by 0.30%.
The diff coverage is 9.80%.

@@            Coverage Diff             @@
##              dev      #26      +/-   ##
==========================================
- Coverage   28.26%   27.95%   -0.31%     
==========================================
  Files          86       88       +2     
  Lines        1472     1499      +27     
  Branches      297      307      +10     
==========================================
+ Hits          416      419       +3     
- Misses       1002     1026      +24     
  Partials       54       54              

Impacted Files	Coverage Δ
src/pages/_app.tsx	0.00% <ø> (ø)
src/components/basket/export-options/index.tsx	7.14% <7.14%> (ø)
src/components/basket/export-options/calendar.tsx	8.33% <8.33%> (ø)
src/components/basket/export-options/image.tsx	3.03% <10.00%> (ø)
src/lib/sections-to-ics.ts	5.00% <13.33%> (+1.29%)	⬆️

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