Gate MPE navtab behind enableMpe and flip enableMpe to false

[taneliang]

Context

#3035. Fix nits.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployments, click below or on the icon next to each commit.

nusmods-website – ./website

🔍 Inspect: https://vercel.com/nusmodifications/nusmods-website/37ZsYXEDwwVhMQVBkPjKXuRoMSbD
✅ Preview: https://nusmods-website-git-eliang-mpe-gate-nusmodifications.vercel.app

nusmods-export – ./export

🔍 Inspect: https://vercel.com/nusmodifications/nusmods-export/9BforSXqUuvPygF4yWivaCFAKH3K
✅ Preview: https://nusmods-export-git-eliang-mpe-gate-nusmodifications.vercel.app

[codecov]

Codecov Report

Merging #3248 (f7ec1ea) into master (759b4ef) will decrease coverage by 0.05%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3248      +/-   ##
==========================================
- Coverage   52.80%   52.75%   -0.06%     
==========================================
  Files         270      270              
  Lines        5713     5715       +2     
  Branches     1316     1318       +2     
==========================================
- Hits         3017     3015       -2     
- Misses       2696     2700       +4     

Impacted Files	Coverage Δ
...rc/views/components/notfications/Announcements.tsx	57.14% <ø> (-21.43%)	⬇️
website/src/views/layout/Navtabs.tsx	90.00% <50.00%> (-10.00%)	⬇️
website/src/featureFlags.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 759b4ef...f7ec1ea. Read the comment docs.

[nusmods-deploy-bot]

Deployment preview for f7ec1eaf ready at http://603a10ea3393c1a462882dd0--nusmods-deploy-preview.netlify.app