Move SPA Stuff into Top of HTML

[DanielJDufour]

Is your feature request related to a problem? Please describe.

Should move redirect stuff into top of the HTML so it's activated immediately rather than having to wait for the webpage to download the bundle and run imports

Describe the solution you'd like

Describe alternatives you've considered

Add script tag to the top of the head

Additional context

https://github.com/GeoTIFF/geotiff.io/blob/master/src/index.js#L26