added frontend env file for non-docker stuf

frontend/.env

@@ -0,0 +1 @@
+REACT_APP_API_URL=

frontend/package.json

@@ -2,6 +2,7 @@
   "name": "frontend",
   "version": "0.1.0",
   "private": true,
+  "proxy": "http://localhost:8000",
   "dependencies": {
     "@dank-inc/data-buddy": "^0.2.0",
     "@testing-library/react": "^11.1.0",

frontend/src/App.tsx

@@ -6,9 +6,11 @@ import { AppContextProvider } from './contexts/AppContext'
 import './app.scss'
 
 const App = () => {
+  const baseURL = process.env.REACT_APP_API_URL || '/api'
+
   return (
     <BrowserRouter>
-      <AppContextProvider baseURL="/api">
+      <AppContextProvider baseURL={baseURL}>
         <UserContextProvider>
           <CoreLayout />
         </UserContextProvider>