userpage: password resets

click "forgot password" on login modal, enter a contact method
address/username, submit and check for a link. Requires link reset to be
enabled.

ts/typings/d.ts

@@ -110,6 +110,7 @@ declare interface Modals {
     discord: Modal;
     matrix: Modal;
     sendPWR?: Modal;
+    pwr?: Modal;
     logs: Modal;
     email?: Modal;
 }