Add example overrides to show how to do some common configuration

[piemonkey]

Overview

Add an example overrides file with ready-made overrides for things such as connecting to different locally running stacks.

connected issues and PRs:

Includes config only useful with lblod/frontend-gelinkt-notuleren-publicatie#130

Setup

To test use with a local harvester, it's necessary to run with the version from the frontend PR. Some config might need tweaking for your local set-up.

How to test/reproduce

Test that you can consume from a local GN and be harvested by a local harvester. See lblod/ember-rdfa-editor-lblod-plugins#579 for instructions.

Challenges/uncertainties

N/A

Checks PR readiness

• UI: works on smaller screen sizes
• UI: feedback for any loading/error states
• Check cancel/go-back flows
• Check database state correct when deleting/updating (especially regarding relationships)
• changelog
• no new deprecations