Fix ansible-galaxy configuration error

Remove incomplete automation_hub configuration that was causing
collection list command to fail with missing URL error.

Changes:
- Remove automation_hub from server_list in ansible.cfg
- Remove incomplete [galaxy_server.automation_hub] section
- Keep only galaxy.ansible.com as collection source

Fixes: ERROR: No setting was provided for required configuration
       plugin_type: galaxy_server plugin: automation_hub setting: url

Verified: ansible-galaxy collection list now works correctly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

ansible.cfg

@@ -51,11 +51,7 @@ always = False
 context = 3
 
 [galaxy]
-server_list = automation_hub, galaxy
+server_list = galaxy
-
-[galaxy_server.automation_hub]
-# url = https://cloud.redhat.com/api/automation-hub/
-# auth_url = https://sso.redhat.com/auth/realms/redhat-external/protocol/openid-connect/token
 
 [galaxy_server.galaxy]
 url = https://galaxy.ansible.com/