Add ability to customize localhost url

[madebyfabian]

I am running localhost from a custom host (https://myapp.local).
The way the localhost detection is currently implemented, the tracker does not recognize if I am on localhost or not, and therefore sends the request.

plausible-tracker/src/lib/request.ts

Lines 40 to 43 in 294405c

	const isLocalhost =
	/^localhost$|^127(?:\.[0-9]+){0,2}\.[0-9]+$|^(?:0*:)*?:?0*1$/.test(
	location.hostname
	) || location.protocol === 'file:';

Possible Implementation

I would suggest to add an option where a user can change their localhost url and therefore making isLocalhost true. Happy to add a PR if you agree.