Wrap emoji stuff in a function, trigger from link click

* Loosen up page url to match per-user `/pulls/` pages
* Hook in to the `filter-item` click event which triggers these

Solves most of https://github.com/conroyp/thumb-checker/issues/5, but seems to be some sort of local storage used once you repeatedly toggle between user pages, which hasn't been hooked in to here yet.