feat: auto save post

[Nirajn2311]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Closes #390

So this is how the auto save feature will work after the user modifies a post:

• The handler will wait for 3 seconds to save the post as long as the user doesn't modify the post in those 3 seconds
• If the handler has not been called in over 5 seconds, for example the user is typing a paragraph continuously, then the post will automatically be saved at 5 seconds.

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/use-debounce@10.0.0	Transitive: environment	+3	442 kB	xnimorz

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[sidemt]

LGTM 👍 Thank you!