Removed unused dependencies

[Drayiss]

Removed the following:

Unused dependencies

• @expo/vector-icons
• expo-constants
• expo-linking
• expo-splash-screen
• expo-status-bar
• expo-web-browser
• firebase (but kept @firebase/firestore)
• react-dom
• react-native-reanimated
• react-native-web

Unused devDependencies

• @types/react-test-renderer
• react-test-renderer
• typescript
  Fixes Unused dependencies clogging up our ecosystem #246

[fmcubium]

Check the backend for unused dependencies as well. If there are no unused dependencies in the backend, just reply to this comment saying that.

[Drayiss]

Ok, I checked the backend for unused dependencies as well. I found some and removed some in my latest commit.

Results of the backend packages:

Successfully removed:

• cors
• ts-node

Unsuccessfully removed:

• @types/jest (see npx tsc errors below)
  jest errors.txt

[h1divp]

Jest is used as a development dependency for our test scripts ran by npm test, I wouldn't move its types package into the main dependency list.
Cors should also be used later for the web (express.js) API, not sure why it isn't included anywhere but doing so will probably avoid some future headaches for why the server may not be able to receive data (see this link).
ts-node also sounds important to me, but I tested running the server without it and it seems to run fine... I'm okay with it being removed but if it causes some large issue, the fix can be made quickly at least, by reinstalling.

I would keep those two packages the way they were.

I'm not too educated on the front-end packages, so I'll save my judgement there. Thank you for your help.

[Drayiss]

Ok, I reverted my previous commit and kept things the way they were, except I removed ts-node.

[fmcubium]

lgtm