Combined the files with the same approach as in the docs:
`jq -rs 'reduce .[] as $item ({}; . * $item)' swagger.template.* > openapi.json`
Afterwards the bundled version can be validated using these commands:
`npx swagger-cli validate openapi.json && npx @redocly/cli lint openapi.json`
* Add basic Greenfield API Get and Delete operations for apps
Will follow-up with PATCH and also with GET which returns more than just basic data later. This sets up the basic stuff first.
* Add methods to LocalBTCPayServerClient
