more documentation on Docker dev workflow

[tracyhenry]

Lack of documentation on Docker dev flow has led to people modifying docker files to run other apps...

We should have more documentation on:

• how to load new data (upcoming in distribute_citus)
• basic commands to log into container and postgres instances
• what if backend crashes
• what if there is new code (e.g. after running git pull)
• how to test a new app (e.g. how to force re-index, how to force not to re-index)
• more?

[tracyhenry]

see

• https://github.com/tracyhenry/Kyrix/wiki/Tutorial#loading-data-into-docker-container
• https://github.com/tracyhenry/Kyrix/wiki/Tutorial#typical-workflow-to-create-a-kyrix-app
• https://github.com/tracyhenry/Kyrix/wiki/Tutorial#a-list-of-commonly-used-commands