refactor(tsx): convert context to ts

Author: fabiovincenzi

src/context.js

@@ -0,0 +1,8 @@
+import { createContext } from 'react';
+import { UserContextType } from './ui/views/RepoDetails/RepoDetails';
+
+export const UserContext = createContext<UserContextType>({
+  user: {
+    admin: false,
+  },
+});