Problems in helm chart deployment guide

[louischan-oursky]

1. Binary/Docker migration requires ./migrations to be present. Should teach the reader to download source code. Unzip, download binary
2. Commands that involves files require volume mount in the docker command. Update them.
3. Running audit database migration requires admin access due to CREATE EXTENSION.
4. Outdated init command. Update it.
5. Redis 6.2 is required.
6. Insert collaborator SQL is missing.
7. Example of values.yaml is necessary.
8. The generated portal client seems missing response_types: ["none", "code"]