Initial commit: Bitwarden export to PDF renderer

Adds the render.py WeasyPrint renderer, the pod-based bitwarden-print.sh
wrapper, a Containerfile, a sample export (JSON + PDF), README and LICENSE.

.gitignore

@@ -0,0 +1,6 @@
+.DS_Store
+__pycache__/
+*.pyc
+.venv/
+build/
+dist/