Spring Cleaning

[chaunmt]

• [x] Update your node_modules (delete it, go to main branch, and do a pnpm install).
• [x] Update your notification settings.
• [x] Clean up codes.
• [x] Document your code.
• [x] Delete unnecessary folders and files (testing etc).
• [x] Update .gitignore to ignore testing folder and uneccessary folders/files.
• [x] Create error handlers.
• [x] Apply error handlers.
• [x] Moving some codes to TypeScript.

[chaunmt]

Everybody go clean up