sorry for not responding to your email, I was swamped.
I looked through the sourcecode, but I can only find UI (ie. browser) code. Does this do anything beyond delivering a more functional and prettier UI on top of an existing zoekt deployment? If no, everybody would be better served if you tried to improve the UI inside Zoekt, which currently is a live demonstration of (my lack of) web app programming skills.
Have you thought of how you will achieve your further goals (eg. semantic search)? That will require server-side changes, but you currently have no Go code at all.