add link to admin painel on user menu

app/javascript/utils/notEmpty.ts

@@ -0,0 +1,3 @@
+// Use a type predicate function to avoid opting out of strict type checking: https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicates
+export const notEmpty = <T>(value: T | null | undefined): value is T =>
+  value !== null && value !== undefined