feat: add resources configuration of browser and doc-server

[lubojr]

Minor addition letting users define resources of docserver and browser services in a similar manner as other (raster/vector) are set up.

Docserver shared settings for both containers is intentional, but can be split if needed.

Would be happy for a review! Thanks!

[pantierra]

Many thanks for the PR!

• Please have a look at the linter, i think there is an nindent that might be different (i guess 12).
• Can you please also add the new fields to the values.schema.json
• And if you want to go fancy, some helm-unit tests (not required for this PR to get in)

[lubojr]

Thank you for the review! I've tried to address all the points. Let's see when the pipeline is approved (I did not test the helm test itself locally).