Add version tag via hardcoded .env variable

[natalynyu]

This PR adds a Footer that contains the app version number via a (currently) hardcoded .env value. The .env-example file was updated to include the APP_VERSION variable. In the future, the version number will come from Github Actions as opposed to a hardcoded value.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run eslint on the code
• [x] I have added JSDoc for all of my code (where applicable)
• [x] I have added tests to cover my changes.

Priority:

• [x] Normal
• [ ] High

Related Issues:

Fixes #618

[codecov[bot]]

Codecov Report

Merging #631 (1026ee5) into develop (300b645) will decrease coverage by 0.04%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #631      +/-   ##
===========================================
- Coverage    95.21%   95.17%   -0.04%     
===========================================
  Files          192      192              
  Lines         4553     4519      -34     
  Branches       555      559       +4     
===========================================
- Hits          4335     4301      -34     
+ Misses         102      101       -1     
- Partials       116      117       +1     

Impacted Files	Coverage Δ
src/server/course/course.service.ts	100.00% <ø> (ø)
...rc/server/courseInstance/courseInstance.service.ts	96.87% <ø> (+1.52%)	:arrow_up:
src/client/components/App.tsx	96.66% <100.00%> (+0.11%)	:arrow_up:
src/server/faculty/faculty.controller.ts	97.46% <100.00%> (-1.68%)	:arrow_down:
...rc/client/components/pages/Courses/tableFields.tsx	93.79% <0.00%> (+1.00%)	:arrow_up:

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[natalynyu]

Looks great! Sorry this got held up by the plague

Thanks Jonathan! No worries at all - hope you are feeling better!