Added precommit hook to run Prettier

[aidenszeto]

Relevant issue

Closes #472

Summary of change

• npm run format command runs prettier
• Husky precommit hook automatically formats code

NOTE: this PR includes prettier formatting, thus there are quite a few lines changed

Testing/Verification

• Frontend should run without errors
• npm run format should format all code in src using prettier recommended standards
• All commits should run npm run format and git add . prior to committing

NOTE: if there are dependency tree issues with eslint version, do the following

1. Delete package-lock.json
2. Delete /node_modules
3. Remove eslint dependency from package.json
4. Re-install dependencies with yarn (not npm)

[aidenszeto]

Looks good but would we run yarn run format or something if we reinstall with yarn or would it still be npm?

Yeah I believe yarn run format would be equivalent to npm run format