Connector help rework

[SimonV-Skyline]

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[SimonV-Skyline]

I've added Jarno as a reviewer because I'd like to get his input but note I don't think we need to wait on his review.
@SkylineCommunications/team-docs-reviewers, once you've applied your magic, feel free to release. We can always take the remarks from Jarno to make further improvements as a second step.

[jarno-lernou]

This more or less in line with https://docs.dataminer.services/user-guide/Cloud_Platform/Catalog/Best_Practices_When_Documenting_Catalog_Items.html.
Can we not simply make a reference to these guidelines?

[MariekeGO]

Since there are some differences, it depends on whether you want to bring the connector pages fully in line with those for other Catalog items. If yes, we can largely replace this text with a reference and just add that a link must be added to the technical page. Otherwise, I could also add a tip referring to the best practices page for general best practices (e.g. the use of visuals).