Simplify installation process and improve documentation

[perennialtech]

This PR aims to simplify the deployment of the Helm chart and improve the accompanying documentation.

• values.yaml

  • Updated external links.
  • Added a note on potential deadlock issues when replicaCount is greater than 1.

• README.md

  • Added a section on removing PostgreSQL PVCs.
  • Removed section on creating PostgreSQL init scripts manually as they are now included by default.

[JuniorJPDJ]

I'm not sure if holding sql files inside the chart is a good idea as it will become out of date quickly.
If you can propose (or even better - implement) some solution to make it not become out of date I'm OK with your solution :D

Thanks for the contribution!

[unixfox]

IIRC the sql files are included in the docker image no? Maybe we should.

[JuniorJPDJ]

hmm, maybe we should merge this and then create issue to fix later, as this PR is correct?

[unixfox]

ok for me