Fairdatapoint

Changed
- Changed the url of Swagger UI from `/ui` to the base url `/`

Added
- PUT method used to update metadata

Changed
- Replaced `flask-restplus` with `connexion` package for OpenAPI generation
- Refactored code based on OpenAPI specification
- Removed ending '/' in endpoints, e.g. '/catalog/' was changed to '/catalog'.
- Removed Bottle and Paste dependecies
- Removed docker compose file for production run

Added
- POST and DELETE methods
- SHACL validator to validate different layers of metadata
- Support for SPARQL database, such as Virtuoso RDF Triple Store
- Docker compose file
- Running in production mode

Changed
- Improved GET and POST methods
- Updated support for common RDF serializations
- Removed loading metadata for the command tool `fdp-run`
- Removed support for INI-based configuration files
- Updated docker file
- Improved unit testing
- Updated README
- Use Bottle and Paste for production run