docs: Document the Projects feature (7.1)

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Adds a new Projects overview page documenting the Mautic Projects feature for the 7.1 branch: what Projects are, creating/managing/deleting Projects (including the duplicate-name check added in 7.1), the two ways to assign items, the assignable item types, the project: search command, and the Project permission set including the Associate permission. Registers the page in the docs toctree after Categories.

Trigger Events

• Deep Analysis: Our docs missing an info about Projects feature. Info might be different between branches (perhaps there are additional functionalities for ea...

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