Add Athena configuration and secrets to inventory and templates

- Updated vault.yml.example to include Athena secrets: secret key, DB password, OAuth client ID, and client secret.
- Modified puck.incus.yml to add Athena service and configuration details, including user, group, directory, port, and domain.
- Updated titania.incus.yml to change OAuth client ID and secret variable names for consistency with Athena.
- Added Athena configuration to mcpo config template, including URL and authorization headers.

ansible/mcpo/config.json.j2

@@ -21,6 +21,12 @@
       "type": "streamable_http",
       "url": "{{argos_mcp_url}}"
     },
+    "athena": {
+      "url": "https://athena.ouranos.helu.ca/mcp/",
+      "headers": {
+        "Authorization": "Bearer 4f4bf67e411cbd787df604c9539865518fccb6b70c8d5b050b71b99b43cdbd82"
+      }
+    },
     "caliban": {
       "type": "streamable_http",
       "url": "{{caliban_mcp_url}}"
@@ -29,20 +35,6 @@
       "type": "streamable_http",
       "url": "{{gitea_mcp_url}}"
     },
-    "github": {
-      "type": "streamable_http",
-      "url": "https://api.githubcopilot.com/mcp/",
-      "headers": {
-        "Authorization": "Bearer {{github_personal_access_token}}"
-      }
-    },
-    "huggingface": {
-      "type": "streamable_http",
-      "url": "https://huggingface.co/mcp",
-      "headers": {
-        "Authorization": "Bearer {{huggingface_mcp_token}}"
-      }
-    },
     "korax": {
       "type": "streamable_http",
       "url": "{{korax_mcp_url}}"