API Documentation: document version 2, point version 1 to the porting page
Updated API Documentation (markdown)
Version 2 spells MTGBAN ids ban
Document the gateway paths, now live
Leave the gateway out until it is live
Say which games id=mkm covers in each version
Name version 2's conditions
Call version 2's per-entry grade a condition
Say version 2 refuses an unknown id
Document version 2's stores and finishes endpoints, and its dropped tag
Add a guide to porting from v1 to v2
API Documentation: add version 2; point the OpenAPI page at the guide
Created API Documentation (markdown)