Improved exports in package and texts for canvases, stations and resources

[mniinio]

• Improved package exports so that method content can be more easily used in projects that depend on the method content.
• Clarified purpose and content of Location Canvas: it should be used to understand, e.g., regulatory, network, and latency issues.
• Clarified purpose and content of the Interaction Canvas: it should be used as a high-level planning tool to discover patterns and operations that the API needs to use. More detailed designs should be done with relevant canvases (REST, Event, GraphQL)
• added description that the API name should be added to the API Business Model Canvas API Value Proposition field.