PLT-5900 Removed automatic configuration of SiteURL (#5952)

* Revert "PLT-5765 Passed SiteURL to SendNotifications (#5705)"

This reverts commit a8e68bd890.

* Removed automatic configuration of SiteURL

* Reverted unintentional config changes

* Updated help text

* Added link to docs in Site URL warning

* Fixed merge conflict

api/admin.go

@@ -311,7 +311,7 @@ func adminResetPassword(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := app.UpdatePasswordByUserIdSendEmail(userId, newPassword, c.T("api.user.reset_password.method"), c.GetSiteURL()); err != nil {
+	if err := app.UpdatePasswordByUserIdSendEmail(userId, newPassword, c.T("api.user.reset_password.method")); err != nil {
 		c.Err = err
 		return
 	}