This commit splits the old `NodeAPIEndpoint` type into three;

* `NodeAPIEndpoint`, which will also contain the freeze endpoint;
* `AnnuaireAPIEndpoint`, which is the plain old node API without extra
  features;
* `CorpusAPIEndpoint`, which will also contain the publishin endpoint.

This split ensures that we don't add endpoints which do not belong to
all three categories, like before.

Furthermore this adds a public nodes SQL queries.
It also adds tests for getUserRootPublicNode

This commit maps the "Publish" action inside CodiMD/HedgeDoc to the
share URL feature.

While doing this, I have also fixed a bug in the current implementation
of ThrowAll (formerly named `throwAll'`).