Rename admin templates to match email

src/main.rs

@@ -352,9 +352,9 @@ fn load_templates(path: String) -> Handlebars {
     reg!("email/pw_hint_some");
     reg!("email/send_org_invite");
 
-    reg!("admin/admin_base");
-    reg!("admin/admin_login");
-    reg!("admin/admin_page");
+    reg!("admin/base");
+    reg!("admin/login");
+    reg!("admin/page");
 
     // And then load user templates to overwrite the defaults
     // Use .hbs extension for the files