Indication of the name of file being edited

Let me just start by saying how fantastic this app has been for me. I have been using geojson.io for a month now and I feel at home. I have a large set of GeoJSON (hundreds) that I edit as a part of my job. With so many files, and multiple tabs open, its easy to loose track of which file is being rendered in the browser tab.

I think it would be awesome to have then name of the file being rendered somewhere in the browser. Maybe even in the html title (ex: **geojson.io - map-unit45-some-st.json**)

Thanks,

Start by tracing how geojson.io loads or identifies the currently rendered file and how the browser title is set. Update the displayed title or another visible browser location to include the current filename, then verify it with multiple open files and tabs.

Written by the indexing model from the issue text.