Query parameters aren't cleared after login with GitHub

[ots22]

See

scivision/frontend/src/App.js

Lines 222 to 228 in 1d99794

	.finally(() => {
	// Clearing the search parameters triggers a
	// reload, and then 'navigate' is never called.
	//
	// window.location.search = "";
	navigate(referrer);
	});

Result is a (spent) OAuth code and state polluting the browser window location.