feat: add theming option to homepage

[nkirukka]

Added theming option

• Page changes to light or dark mode when user clicks a button on the navbar
• Change persists on refresh

Screenshot

Video

https://user-images.githubusercontent.com/72361299/204387655-624c9e36-5b02-4220-bf67-b2fc62413198.mp4

Issue ticket number and link - If Any

37

Checklist before requesting a review

• [x] I have performed a self-review of my code.

• [x] Followed the repository's Contributing Guidelines.

• [x] I ran the app and tested it locally to verify that it works as expected.

• [x] I have starred the repository.

Additional Information (Optional)

[nkirukka]

I left off doing the rest of the pages because I find that I was repeating myself as there's some layout issues. I thought it best to wait till some more work is done or at least till the new landing page is synced with the proper folder.

[devarshishimpi]

@nkirukka I think you have committed the wrong files in the PR and can't find the changes. I am closing this PR, you can create a new one for the same