Add virtualenvs to sphinx ignore (#1840)

We don't want to try and include these directories in our output

conf.py

@@ -81,7 +81,7 @@ language = "en"
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This patterns also effect to html_static_path and html_extra_path
-exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
+exclude_patterns = ["_build", "Thumbs.db", ".DS_Store", 'env', 'venv', 'ENV', '.venv', '.env']
 
 # The reST default role (used for this markup: `text`) to use for all documents.
 # default_role = 'cpp:any'