Add descriptions for purchase endpoints
Change order of ticket post attributes
Add search response json attributes description
Add some basic error responses
Add sad path error responses for tickets
Add sad path error responses for purchase
Leave only HTTP methods and paths
Add terminal attributes in glossary
Add city attributes in glossary
Correct some details for search attributes
Add trip attributes in glossary
Add queried purchase attributes in glossary
Change search dates to dashed in GET /search
Factor out search into own file
Add duration parameter for search