Give existing issue results when typing in your issue title
Description
To help triage issues and make conversation engaged by more people I think we should implement the functionality stack overflow has in some way or another. It basically gives results when typing in the title of your issue. These results are existing issues that may stop you from creating an additional issue for a problem.
Proposal
Single Source of Truth
default view (switched template and title bar around)
begin typing (searching for results) uses: fa-spinner
hover results clicking opens up new tab!
Links / references
gitlab-com/www-gitlab-com!2913 (merged)
cc: @jschatz1 @dzaporozhets @JobV @nick.thomas @tauriedavis @stanhu @pcarranza