Replace icon_url with icon_path in __init__.py.

In line with the documentation the correct key for the path of the icons folder in the launcher_entry is icon_path and not icon_url. See https://jupyter-server-proxy.readthedocs.io/en/latest/server-process.html

Author: ka-zo

contrib/template/{{cookiecutter.project_name}}/jupyter_{{cookiecutter.project_name}}_proxy/__init__.py

@@ -12,6 +12,6 @@ def setup_{{cookiecutter.project_name}}():
         'environment': {},
         'launcher_entry': {
             'title': '{{cookiecutter.project_name}}',
-            'icon_url': os.path.join(os.path.dirname(os.path.abspath(__file__)), 'icons', '{{cookiecutter.project_name}}.svg')
+            'icon_path': os.path.join(os.path.dirname(os.path.abspath(__file__)), 'icons', '{{cookiecutter.project_name}}.svg')
         }
-    }
+    }