Minor changes for Avail demo

[luketchang]

Motivation

Minor fixes to get Avail demo up and running

Solution

• Copy configs into docker image root
• Switch db path to /usr/share/nomad
• Lower page size for processor to prevent over loading RPC endpoint

PR Checklist

• [ ] Added Tests
• [ ] Updated Documentation
• [ ] Updated CHANGELOG.md for the appropriate package
• [ ] Ran PR in local/dev/staging