[Feature] Introduce Search functionality with LUNR.js or other library

## Problem
There are many resources present in the resource archive. Also, we might witness more resources to be added there. To navigate easily to the desired resources, One should be able to use the power of search libraries to use features such as fuzzy search, etc..

## Description
We can utilize some lightweight library to implement the proposed functionality to the site. Lunr is a lightweight yet powerful library that can by used.

## Additional context
More info about LUNR can be found at : [Lunr Docs](https://lunrjs.com/docs/index.html)
Also, A similar issue exists that talks about including a search bar for the site: #36

## Implementation

- [x] I would be interested in implementing this feature.