Feature/refresh docs 2025/homepage improvements

[Abhi-MS]

What kind of change does this PR introduce?

Removed APK Install guide from the website. Updated links. Made website responsive for all screens.

Issue Number:

Fixes #916

Did you add tests for your changes?

No Visual testing was done for various screen sizes using chrome dev tools

Snapshots/Videos:

Talawa-Docs_.Powered.by.The.Palisadoes.-.Google.Chrome.2025-01-01.19-27-51.mp4

Talawa-Docs_.Powered.by.The.Palisadoes.-.Google.Chrome.2025-01-01.19-30-33.mp4

If relevant, did you update the documentation?

No update in documentation was needed.

Summary

This PR makes the website more responsive on all screen sizes. Links on the website are updated to make the website more intuitive.

Does this PR introduce a breaking change?

No

Other information

Get the App was linked to https://docs-mobile.talawa.io/docs-talawa-apk/

Have you read the contributing guide?

Yes

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