* to eliminate the necessity to remember and manually enter the URL
  every time

* apparently, the previous config-based approach stopped working

* use blueprint entrypoint instead of initializing it in the extension
* move finalize_app code into a new separate module

* the current versions of invenio-accounts and invenio-oauthclient (both
  v2.0.1) use the same 'blueprint.record_once' mechanism to modify the
  config values, leading to race conditions with our hack
* the config override has been moved to invenio-config-tuw

* take advantage of `blueprint.record_once()` for setup logic, which is
  called during registration of the entrypoint blueprints (which happens
  after the invenio extensions have been loaded)
* this pattern is already used in some core modules
  (e.g. invenio_rdm_records.views v1.0.0)