fix(docs): don't include rst files from .venv

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2499>

docs/conf.py

@@ -110,7 +110,7 @@ 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", ".venv"]
 
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = "sphinx"