public accessible post

[A-ryan-Kalra]

This PR fixes issue #102. Added an icon that will display which post is publicly accessible.

https://github.com/NayamAmarshe/writedown/assets/80680671/16999605-c066-4147-8e6f-a604319523c9

Summary by CodeRabbit

• New Features

  • Introduced a custom hook useMounted to track component mount status.

• Enhancements

  • Simplified note data management by consolidating multiple state atoms into a single selectedNote object.
  • Updated UI components to reflect changes in state management using selectedNote properties.

• Bug Fixes

  • Fixed issues related to toggling public viewing and saving notes.
  • Corrected file download filenames to use the note's title.

• Chores

  • Modified Firebase script in package.json to stop certain ports before starting emulators.