fix:Added transition for smooth closing of sidebar

[priyanshagra]

A meaningful title for PR, not like: made changes to xyz.md

Fixes #664

Ref #

Changes done:

• Added transition of 0.3 sec in .main.sidebar-toggle class

Screenshots

https://github.com/CircuitVerse/Interactive-Book/assets/127022024/9e7b6fc5-726a-4b02-a884-6d4403e3baef

Preview Link(s):

✅️ By submitting this PR, I have verified the following

• [ done] Checked to see if a similar PR has already been opened 🤔️
• [ done] Reviewed the contributing guidelines 🔍️
• [ done] Sample preview link added (add the link(s) for all the pages changed/updated from the checks tab after checks complete)
• [ done] Tried Squashing the commits into one

[priyanshagra]

@tachyons @tanmoysrt please check

[priyanshagra]

@VaibhavUpreti please check

[tanmoysrt]

@tachyons @tanmoysrt please check

Also add trasition while opening the sidebar as well.

[priyanshagra]

that is not possible i thought suggest me if you can help