docs: remove PostgreSQL from the "Che architecture"

[ibuziuk]

Is your task related to a problem? Please describe

Postgres was removed in 2023 - https://che.eclipseprojects.io/2023/03/20/@ilya.buziuk-decommissioning-postgresql-database.html
However, we never updated docs :/

https://eclipse.dev/che/docs/stable/administration-guide/server-components/

Describe the solution you'd like

remove PostgresSQL images / mentions from https://eclipse.dev/che/docs/stable/administration-guide/server-components/

Describe alternatives you've considered

No response

Additional context

No response

[ibuziuk]

@svor @deerskindoll please prioritize for the next sprint

[deerskindoll]

I searched the docs and this seems to be the only mention of postgresql: https://eclipse.dev/che/docs/stable/administration-guide/calculating-che-resource-requirements/

[deerskindoll]

@svor the only references I could find are in the following doc: https://eclipse.dev/che/docs/stable/administration-guide/calculating-che-resource-requirements/

do you want me to simply remove the references or is there anything else I need to do?

[svor]

@deerskindoll yes, please remove the references and also need to remove PostgreSQL icon from the images on these pages:

• https://eclipse.dev/che/docs/stable/administration-guide/server-components/
• https://eclipse.dev/che/docs/stable/administration-guide/che-server/

[deerskindoll]

done! can I close the issue?

[svor]

@deerskindoll
I don't see any information about PostgreSQL in the doc, feel free to close it!