revert: restore logo_only theme option removed out of scope

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: farhan

docs/conf.py

@@ -171,6 +171,7 @@
     "repository_url": "https://github.com/openedx/xapi-db-load",
     "repository_branch": "main",
     "path_to_docs": "docs/",
+    "logo_only": True,
     "home_page_in_toc": True,
     "use_repository_button": True,
     "use_issues_button": True,