Fix/reimplement search feature

[pcardune]

Depends on #482

It doesn't have any tests and is currently broken. I know we'll need to have search functionality eventually, but is it necessary for the alpha release? If not, we should just disable it for now. AFAIK, the only way to access it is via a keyboard shortcut. Leaving this as a separate issue from #390 since that's just about code quality.

[schanzer]

I think it's fine to delay this for a11y-beta. We'll want to get Sina's take on whatever implementation we come up with, so it's important to have that done in time that.

[pcardune]

ok, so sounds like there are two tasks. One to disable it for now (that should be pre-alpha IMO), and second one to get it working again for a11y-beta. I'll update this task to be the latter and create a new issue for the former.