Enable auto-fill options on web app homepage search bar

[bourque]

It would be neat if we could enable a feature wherein when a user begins to enter a rootname or proposal number, a dropdown appears with the possible remaining options for said rootname/proposal number.

[bhilbert4]

This is over my head at the moment, but looks like it could be helpful? https://django-autocomplete-light.readthedocs.io/en/master/tutorial.html

[stscijgbot-jwql]

This issue is tracked on JIRA as JWQL-235.