build(docs): Remove old releases variables

Author: tony

docs/conf.py

@@ -23,11 +23,6 @@
     'recommonmark',
 ]
 
-releases_unstable_prehistory = True
-releases_document_name = ["history"]
-releases_issue_uri = "https://github.com/vcs-python/libvcs/issues/%s"
-releases_release_uri = "https://github.com/vcs-python/libvcs/tree/v%s"
-
 issues_github_path = about['__github__']
 
 templates_path = ['_templates']