Fix doc build

support/mkdocs

@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+# A script to invoke mkdocs with the correct environment.
+
+import os, subprocess, sys
+
+dirname = os.path.join(os.path.dirname(__file__), 'python')
+
+# Set PYTHONPATH for the mkdocstrings handler.
+env = os.environ.copy()
+path = env.get('PYTHONPATH')
+env['PYTHONPATH'] = (path + ':' if path else '') + dirname
+
+config_path = os.path.join(dirname, 'mkdocs.yml')
+args = sys.argv[1:]
+if 'build' in args:
+    args += ['-f', config_path]
+subprocess.run(['mkdocs'] + args, env=env)