Add a "cookbook" style recipe page with examples for each supported language

[jen20]

It would be nice to present short, focused examples for common questions in the style of "cookbook" documentation. Some example scenarios to start with:

• How do I use a data source to look up an existing resource and then use the .get to populate parameters for it?
• How do I use multiple provider instances?
• How do I use computed value in control flow?
• How do I use await when constructing components?
• How do I transform an unknown value from one component to use as an input for another?

Please feel free to add other questions to the list!

[joeduffy]

I love this idea -- let's pair up to try to move the needle on some of this during M19, as part of our overall focus on improving overall onboarding documentation.