New search page integration stuff

[aluhrs13]

@anaximander23 Tracking minor things we (I can tackle all of these probably unless something jumps out to you) should look at as I look at integrating this.

• [x] Icon font no longer working.
• [x] Searching for tags then removing all tags and clicking search still keeps the previous tags.
• [x] General styling
• [x] Re-add source icons
• [x] Add a list of "top" tags
• [ ] Dynamically grow the text area as tags are added
• [x] Telemetry on searches
• [x] Smallest breakpoint should shift the search to the top
• [x] Adding and removing tags from Minis isn't working.
• [x] fix mobile width
• [x] get tooltips working on mobile

[anaximander23]

The missing icon font is probably just because I missed it when setting up webpack; I notice that site.js has an entry for the open-iconic CSS, but no fonts, so I presume it's just a matter of adding the requisite imports there.

The thing about not removing tags properly will just be an oversight in tags-tagify.js somewhere. It might be that instead of what's happening in onFormSubmitted(), it would be better to attach to the add and remove events and keep tagsValue in sync that way. I felt like that was mildly hacky anyway.

[aluhrs13]

Styling pretty much there :)