Add <radio4000-search> algolia component input thing

I took the search input from https://github.com/internet4000/radio4000-search-index/blob/master/client/index.html, wrapped it in a custom element and added it to the main navigation. It also changes radio when you select something.

Not sure if the script loading is a great idea, but seems to work. Do you have some feedback? Note: it uses the live db and nothing else.