Configure dependencies page

It is a bit difficult to see best practices around using and defining options.

- accesing info via ``self.dependencies`` not ``self.options["dependency"]``
- Pattern usages
- Best in profiles

Feedback by @mpusz

Start by locating the documentation page covering dependency configuration and options. Review the listed topics—self.dependencies, pattern usages, and profiles—and update the page so these best practices are clearly explained; done means each requested topic is covered.

Written by the indexing model from the issue text.