Add "Random Post" Button on Homepage

[KODURISAIKIRAN]

Description:
This PR adds a "🎲 Random Post" button to the homepage of the Public Lab website. The button is designed to enhance user engagement by letting visitors discover a random post with a single click. It's a fun and interactive way to explore content on the site.

Changes made:

Added a button labeled "🎲 Random Post".

The button links to the route /random, which loads a randomly selected post.
Related Issue:
Fixes #11187
Screenshot

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[codeclimate]

Use empty lines between method definitions.

[codeclimate]

Code Climate has analyzed commit 8a1d8da and detected 1 issue on this pull request.

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Style	1

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