Fixed connection error when base url with '#' is provided as the connection url

[ahmdthr]

If a url is copied from the browser from a GeoNode instance e.g., https://stable.demo.geonode.org/#/ it contains an a hash sign at the end which fails to connect. This fixes the issue by parsing the provided url.

This PR fixes issue 274.

[Gpetrak]

@ahmdthr thank you for the PR. I tested the PR and although it doesn't have some conflict with the QGIS GeoNode plugin, it doesn't seem to fix this issue. In my tests the error remains the same.
I propose to add a similar change in the connection_dialog.py file also, since the connection settings are retrieved from the function get_connection_settings. Thus, if you replace the line:
base_url=self.url_le.text().strip().rstrip("/")
with
base_url=self.url_le.text().strip().rstrip("#/")
in the connection_diolog.py file (line 143)
https://github.com/GeoNode/QGISGeoNodePlugin/blob/main/src/qgis_geonode/gui/connection_dialog.py#L143
It will work.