- add authsign to docker-compose.yml
- add signing.sample.yaml to be copied to signing.yaml for authsign
- add WACZ_SIGN_URL and WACZ_SIGN_TOKEN to config.sample.env
- signing enabled if WACZ_SIGN_URL is set
- add instructions on how to enable signing to Deployment
- update .gitignore, don't commit 'signing.yaml'
- update images to use public repo browsertrix images