better headings, re-ordered content

[AtmaMani]

I like this project and expect to use it heavily. Doing my part in improving the gallery page. I inserted ToC using Table of Contents Jupyter extension and re-arranged some of the cells.

[nicolaskruchten]

Thank you for this PR and for your excitement about this library in general :)

I'd be OK with merging it but at the moment it's not clear to me how I can maintain this TOC moving forward... can you provide instructions for me to update the TOC if/when I add a section? It seems like this cell just contains a bunch of HTML at the moment.

Ideally everything would be automated in the make_docs.sh shell script such that all I would need to do is update the notebook and run the script which handles the output.

I should add that the gallery notebook will likely not remain the main landing page of https://plotly.express/ as it takes a while to load and isn't all that pretty :)

[AtmaMani]

I agree with all your points, its a great start, but you may reformat it like regular Plotly gallery. Regarding the TOC, if you use this extension: Table of Contents Jupyter extension it would keep your ToC up to date whenever you edit the notebook. I think you can call it with nbconvert in a headless fashion and update the toc, but I have not tried this workflow yet.

[AtmaMani]

Closing this as it is no longer relevant