Change api endpoint to be /api instead of /openapi #2114
                
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Overview
Cf
OGC API Features - Part 1 (https://docs.ogc.org/is/17-069r4/17-069r4.html#_api_definition_path_rootapi_link) para 7.3.1, permission 1: "it MAY be hosted as a sub-resource to the base path of the API, for example, at path /api"
OGC API Common Part 1 (https://docs.ogc.org/is/19-072/19-072.html#_6f30c0b2-ff4c-4c38-8d51-bd124f4b76cc) para 9.2, Recommandation 15.A: "The server SHOULD support the HTTP GET operation on the URI {root}/api."
Dependency policy (RFC2)
Updates to public demo
Contributions and licensing
(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)