EdgeDB make queries runnable in documentation project

Brief

• Can only work against a pre-defined schema (movies schema in interactive tutorial)
• Change most queries to run against that schema
• Start working on it to see how much work it will be
• Selects, inserts, updates
• Not every one has to be runnable
• Schema: https://github.com/edgedb/edgedb.com/blob/master/content/tutorial/dbschema/schema.esdl
• Data: https://github.com/edgedb/edgedb.com/blob/master/content/tutorial/dbschema/migrations/00002.edgeql

Notes

• docs/edgeql/paths.rst may require modifications to the schema or a different schema, or a significant rework of the content to fit the current schema
  • Current schema does not have any links within a single type to itself or any deep nested which would make the deeper paths impossible to demonstrate
  • Some of the types in the current schema have multiple links, which is not the case in the tutorials schema
  • Tutorial schema needs two links to a type from different types with the same name (author from both BlogPost and Comment in the current example)