Add search by parameters

[poadoc]

#297

[mrin9]

Thanks for the PR. It is a great contribution.

We are in the process of receiving feedback from our design team and user-base for the features. Also testing performance with large specs.

Following are some of the findings

• Design team wanted some minor style changes. Also there should be support for both dark and light theme. currently it supports only the light theme
• User base and User-experience have reported some tweaks to the way the search result is represented
• It should offer more flexibility in terms of what user like to search... not just parameter search
• do not search parameter descriptions/summary as some large specs gets into performance issues

But having said that, DO NOT UPDATE this PR. We are still reviewing this
We are more likely to accept this PR as is to record your contribution and then make some tweaks to it once we complete the feedback process

[mrin9]

Thanks for the great PR !!!