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

[welcome]

Thanks for opening this pull request! This space is protected by our Code of Conduct - and we're here to help.
Dangerbot will test out your code and reply in a bit with some pointers and requests.
Also please refer here for installation help 💿
There may be some errors, but don't worry! We'll work through them with you! 👍🎉😄


One thing that can help to get started is to make sure you've included a link back to the original issue you're solving, in the format fixes #0000 (for example). And to make sure the PR title describes what you're trying to do! (often it can be the same as the issue title) Thanks! 🙌


Then, you can say hello in our chatroom & share a link to this PR to get a review! 👋 ✅

[qlty-cloud-legacy]

Use empty lines between method definitions.

[qlty-cloud-legacy]

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

Here's the issue category breakdown:

Category	Count
Style	1

View more on Code Climate.