Add Local Development Demo Data (#502)

* Clean up seeds, add development demo data

* Handle liability account display and sync

* Fix tests

README.md

@@ -31,12 +31,15 @@ cd maybe
 cp .env.example .env
 bin/setup
 bin/dev
+
+# Optionally, load demo data
+rake demo_data:reset
 ```
 
 And visit http://localhost:3000 to see the app. You can use the following credentials to log in (generated by DB seed):
 
-Email: `user@maybe.local`
-Password: `password`
+- Email: `user@maybe.local`
+- Password: `password`
 
 For further instructions, see guides below.