revamp - DQL recipes

[rderbier]

[rderbier]

Extract example from the doc to create a DQL recipes by use case. Example :"find movies where at least on actor is playing multiple roles" ... and explain the query with reference to the feature used (value variables, blocks etc ...) Keep also the sample in the reference to illustrate the DQL language.

The point is that users can look for a query looking like their problem to find the solution instead of having to go through the all DQL reference doc to discover what can be done.

[rderbier]

Could be in "Queries examples" section under DQL

[github-actions[bot]]

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