MPE: Add FAQ and fix crashing module details fetch

[taneliang]

Context

#3035. Details in email and our private NUSMods Telegram group (sorry everyone else! We're trying to ship this asap. Would be happy to explain the context if you comment)

[vercel]

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nusmods-website – ./website

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nusmods-export – ./export

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[codecov]

Codecov Report

Merging #3261 (b351356) into master (b085737) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3261      +/-   ##
==========================================
+ Coverage   52.79%   52.80%   +0.01%     
==========================================
  Files         270      270              
  Lines        5720     5717       -3     
  Branches     1319     1320       +1     
==========================================
- Hits         3020     3019       -1     
+ Misses       2700     2698       -2     

Impacted Files	Coverage Δ
website/src/apis/mpe.ts	0.00% <0.00%> (ø)
website/src/views/mpe/MpeContainer.tsx	0.00% <ø> (ø)
website/src/views/mpe/form/MpeFormContainer.tsx	0.00% <0.00%> (ø)
website/src/views/timetable/Timetable.tsx	93.54% <0.00%> (-3.23%)	⬇️

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[nusmods-deploy-bot]

Deployment preview for b3513568 ready at http://603f9a005ea319640d6b7a39--nusmods-deploy-preview.netlify.app

[taneliang]

Verified to work:

Original crash repro steps:

1. Add MA2002
2. Reload
3. Observe crash as MA2002.json doesn't exist in our modules