Autocomplete feature for tags

Introduce tagsService which will handle the necessary filtering of tags
and saving them into the local storage in an appropriate format.

s/Heroku/Docker/

Refresh UX

After performing a search, there's already a clear search link in
the view. Without a border around the search bar, the clear icon
looks a little lonely and strange all the way over on the right.
I offer that users have plenty of ways to clear text boxes and
we needn't give them this one.

Requires some small tweaks around various places we have icons in
use. In fact, this actually eliminates a lot of the small tweaks
in favor of more flexible alignment.

Rather than absolute positions and padding and whatnot just set
the width on the input element and set white-space: nowrap to ensure
it and the icon are side-by-side.

Better to use data attributes for signaling the intent than to
be overloading the CSS class.

Clean up and delete a few unneeded things.