Handle api error json (#18)

* Handle api error json

* Fix get vehicles error handling
Update .env.template

src/utils/http.js

@@ -0,0 +1,14 @@
+export const getAuthHeaderOptions = (token) => ({
+    "Authorization": `Bearer ${token}`,
+  });
+
+export const fetchRespHandler = (response) => {
+  if (response.ok) return response.json();
+
+  return response.text()
+    .then((text) => JSON.parse(text))
+    .catch((e) => ({
+      error: response.statusText,
+      message: `${response.status} ${response.statusText}`,
+    }))
+}