permit location argument

[JeffAbrahamson]

Feature request: Permit argument to specify location. E.g.

https://velo.professeurjoachim.com/geospecifier/

Actually making that a nice interface probably means something more complicated, like search -> URL with geo-specifier -> button to make this location the default (if / still reads the cookie to decide on location). Which might be more complexity than you want. But it would let me have a couple locations handy.

Alternatively, the cookie could specify a list of my favourites and there's a dropdown that lets me choose.

The app is really cool (thanks!), it's just I tend not to use it when away from home because I have to search and then do the same again when home.