Highlight jupyter notebooks in the gallery

[melissawm]

📚 New content request

We should highlight the examples gallery, and also make it more explicit that all examples can be downloaded as jupyter notebooks.

Outline

Mention in

• ToC
• Quickstart
• Each example
• Gallery landing page

[melissawm]

We should probably mention https://napari.org/stable/tutorials/fundamentals/getting_started.html#launch-jupyter and perhaps improve the content in this section.

[psobolewskiPhD]

Some overlap with remote use of napari. https://github.com/napari/docs/issues/29

Wonder how feasible making a napari examples binder would be? Or maybe we just set up a simpler one, like the workshop template repo.

[psobolewskiPhD]

One caveat: the notebooks generated in the gallery are kinda weak -- basically one giant code cell. If Jupyter has an option to split cells, we may want to mention it in the blurb.