feature: Implement Progressive Web App (PWA) features

[SATYAM1000]

Is your feature request related to a problem? Please describe.
It would be a great enhancement for the website to function as a Progressive Web App (PWA). Implementing PWA features will allow users to:

Install the website as an app on their devices.
Access content offline.

👉 PWAs offer a more engaging user experience by making websites behave like native applications. Implementing PWA will provide:

Offline functionality: Users can still interact with content without an internet connection.
Improved engagement: Users can install the website as a web app, increasing return traffic.

Describe the solution you'd like
I would like to add Progressive Web App (PWA) functionality to improve the website. The solution includes:

Service Worker: Cache important assets to provide offline functionality.
Web App Manifest: Create a manifest with details like app name, icon, start URL, and theme color for adding the site to the home screen.
Add to Home Screen (A2HS): Let users install the website as a web app on their devices.
HTTPS: Ensure the website is served over HTTPS.
App Shell: Build an app shell to make core parts of the site load faster.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Adding PWA functionality will allow users to use the website offline and install it like an app, which can improve the overall experience.

[SATYAM1000]

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