Simple UI for Departure messages

[toretefre]

Implementing first version of #13

Before I opened this Pull Request, I have:

• [X] written 📝 code documentation where it made sense
• [x] written tests 🔬, where it was necessary
• [x] updated the CHANGELOG.md file 📝
• [X] referenced all the issues in commits related to this PR

according to my best knowledge.

[codecov[bot]]

Codecov Report

Merging #29 into feature/messages will increase coverage by 3.49%. The diff coverage is 40%.

@@                 Coverage Diff                  @@
##           feature/messages      #29      +/-   ##
====================================================
+ Coverage             53.04%   56.54%   +3.49%     
====================================================
  Files                    39       30       -9     
  Lines                   328      237      -91     
  Branches                 53       30      -23     
====================================================
- Hits                    174      134      -40     
+ Misses                  132       89      -43     
+ Partials                 22       14       -8

Impacted Files	Coverage Δ
src/lib/router.js	100% <ø> (ø)	:arrow_up:
src/App.js	57.14% <ø> (-30.36%)	:arrow_down:
src/lib/i18next.js	100% <ø> (ø)	:arrow_up:
src/components/Dashboard.jsx	66.66% <0%> (+16.66%)	:arrow_up:
src/lib/firebase.js	100% <100%> (ø)	:arrow_up:
src/components/Messages.jsx	33.33% <33.33%> (ø)	:arrow_up:
src/components/Departure.jsx	41.66% <41.66%> (+41.66%)	:arrow_up:
src/components/shared/DestructButton.jsx	100% <0%> (ø)	:arrow_up:
... and 16 more

---

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 792d4b8...6cd0a7e. Read the comment docs.

[lighthousebot]

Updated Lighthouse report for the changes in this PR:

Category	New score	Required threshold
SEO	80	-
Performance	0	-
Progressive Web App	100	1
Accessibility	81	-
Best Practices	93	-

Tested with Lighthouse version: 4.1.0

[balazsorban44]

Moving milestone up to Sprint 2, as it was not finished on time.

[lighthousebot]

Updated Lighthouse report for the changes in this PR:

Category	New score	Required threshold
SEO	80	-
Performance	0	-
Progressive Web App	100	1
Accessibility	81	-
Best Practices	93	-

Tested with Lighthouse version: 4.1.0

[toretefre]

Good suggestions. Will implement them as soon as possible.