Fix Build in POSIX Shell

Author: burak-tb

deploy.php

@@ -43,7 +43,7 @@
 
 # Build the documentation
 task('python:build_documentation', static function () {
-    run('bash -lc ". .venv/bin/activate && bin/build_docs"');
+    run('./.venv/bin/sphinx-build -b html docs docs/_build/html');
     run('ln -sf docs/_build/html pub');
 });