feat: Implemented border when hover

[rishabdev2997]

feat: Highlight or add left border to active navbar subitem

487 - added the feature.

In the issue the problem was not mentioned properly(the download nav item gets a left border for distinction. The same can apply to nav sub-items.) but it seems it indicates navs under the "Table of Contents" section must display the same left border upon selection.

How to see the changes

• Go to documentation.
• Go the environment.
• Now move your mouse over the contents of the table.

Here is the Screenshot

https://github.com/user-attachments/assets/04af6693-633f-4602-90c8-3399463e9384

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[rishabdev2997]

Added spacing between each content items in the list

Updated Screenshot for #508

https://github.com/user-attachments/assets/9e4218f9-dd8f-4c6f-b2df-c2c9358eebb7

[Stefterv]

Also @SableRaf lmk if the visual changes are approved, especially regarding the spacing and fontsize changes

[SableRaf]

Thanks @Stefterv! Yes it looks good to me visually.

[SableRaf]

Hey @rishabdev2997! Just checking in—are you still interested in finishing up this PR? Let me know; otherwise, I'll go ahead and close it. Thanks!

[rishabdev2997]

@SableRaf I will finish it in 3 days. sorry for late reply

[SableRaf]

Sure thing! No worries. Thanks for your reply :) let us know if you need any support.

[rishabdev2997]

I will make a new pr with the updates @SableRaf