Updated todo.html

[ShivanshAr97]

trafficstars

Fixing problem of adding notes

🛠️ Fixes Issue (Number)

Closes #812

👨‍💻 Changes proposed

Changes in UI and adding few new features.

✅ Check List (Check all the applicable boxes)

• [x] My code doesn't break any part of the project (Zero Octave-Javascript-Projects).
• [x] This PR does not contain plagiarized content.
• [x] My Addition/Changes works properly and matches the overall repo pattern.
• [x] The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

User is now able to add as well as delete notes.

📷 Screenshots

[Astrodevil]

Hey @ShivanshAr97 You have added js in the same html file then whats the use of previous js file. Please don't break file order.

[github-actions[bot]]

Thank you @ShivanshAr97 for taking out your valuable time in order to contribute to our project. Looking forward for more such amazing contributions :)