conf.py: exclude common/* (#491)

Avoid that common/setup.html is generated

Author: haampie

.gitignore

@@ -10,3 +10,4 @@ __pycache__
 /._view
 /view
 /.spack-env
+/.venv

conf.py

@@ -213,7 +213,7 @@ def setup(sphinx):
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-exclude_patterns = ["_build", "_spack_root", "view", "._view"]
+exclude_patterns = ["_build", "_spack_root", "view", "._view", "common/*", ".venv"]
 
 # The reST default role (used for this markup: `text`) to use for all documents.
 # default_role = None