(deliverable-new-repo branch) Readme instructions are incorrect

In the `deliverable-new-repo` branch's readme, it's stated that these commands can be executed in order to create a local spin-up of the keycloak + potsgres with HTTPS on localhost using docker compose.
```bash
keycloak-ssi compose up -d # boots Postgres + Keycloak with HTTPS on localhost
keycloak-ssi config # configures realm, clients, demo users, keys
keycloak-ssi test preauth IdentityCredential
```
However, the `keycloak-ssi config` would fail because it's blocked by `get_keycloak_pid`.
This bash function tries to look for an active keycloak process locally, while in reality, keycloak was deployed through docker compose, in a docker container.