Add molab badge

Add "Open in molab" badge(s) linking to marimo notebooks. The badge can be added to any target: a GitHub README, documentation site, blog post, webpage, or any other markdown/HTML file.

Instructions

0. Session export for molab

molab previews render much nicer if the github repository has session information around. This can be added via:

uvx marimo export session notebook.py
uvx marimo export session folder/

This executes notebooks and exports their session snapshots, which molab uses to serve pre-rendered notebooks.

Key flags: