Attempt to debug SSL cert validation error

This changeset introduces a few changes:

* Removes UK Notify Logo URL and config
* Removes UK Notify API URL and replaces with Notify.gov
* Improves the error handler for HTTPErrors to provide actual exception and stack trace information

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

.ds.baseline

@@ -161,7 +161,7 @@
         "filename": "app/config.py",
         "hashed_secret": "577a4c667e4af8682ca431857214b3a920883efc",
         "is_verified": false,
-        "line_number": 123,
+        "line_number": 121,
         "is_secret": false
       }
     ],
@@ -634,5 +634,5 @@
       }
     ]
   },
-  "generated_at": "2025-07-22T17:07:31Z"
+  "generated_at": "2025-07-29T21:32:59Z"
 }