[❗ Enhancement] Repository Improvements

[EdricChan03]

It's about time to actually improve this repository.

Emoji key

Emoji	Description
❗	The task has a high priority
🚧	The task is currently being worked on
❎	The task will not be worked on
🕘	The task will be delayed until further notice
🔗	The task has a linked PR/commit

Tasks

Maintainer improvements

• Add issue templates
  • Bug reports
  • Feature requests/enhancements
  • UX/UI requests/enhancements
  • Other templates (if necessary)
• Add contributing guide
  • Expected commit/contributing standards
  • Indicate how to run the app locally
• Handle issues/PRs from first-time users
• Review repository labels [:construction:]

Existing issues/PRs

• Work on outstanding issues [:clock9:]
• Merge outstanding PRs [:clock9:]

Continuous Integration

• Add initial GitHub Actions [:construction:]
  • Unit testing (introduced with 7af5da8)
  • Deploy to Firebase
  • Stale issues/PRs (introduced with 7af5da8)
  • Code scanning (introduced with 7af5da8)

Other

• Improve repository transparency
  • Add updates document to the wiki/repository
  • Add initial help guides
• Invite maintainers?