Explicitly name examples to help users navigate where to start

[zacdezgeo]

In the current playground, the examples are listed by their file name. It would be amazing to list the examples to a user based on what the underlying queries perform.

[bitner]

Main reason that they are listed by their file name is that they refer to specific examples that come from the specification itself: https://github.com/opengeospatial/ogcapi-features/tree/master/cql2/standard/schema/examples

[zacdezgeo]

Got ya, let me know what you think of: #72