Allow Key/Value Parameters in Search box

[jag3773]

Story

As a user I want to use key/value searches so that find what I'm looking for.

Notes

Our search URL scheme allows for several key value pairs to be used, see #445 . However, these are not usable in the search box on the Browse page. It would really help users find and link to the content they want if they could use these key value pairs.

A similar feature is available in Github, Gmail, etc. Here is a Ruby reference implementation, https://github.com/openstax/keyword_search .

Note, the URL backend is already there, this task is to add the user facing functionality into the search box.

Example

Entering this into the search box:

would load https://door43.org/en/?repo=en_ulb and keep the text in the search box.