This adds a prototype functionality for "glue and paste" with MyST-NB. It closes #4
You glue things into a notebook's metadata like this:
from myst_nb import glue
glue("your-key", an_object)And it will run IPython's display on the object, then store the mimebundle
at the key you specify.
When the notebooks are parsed with MyST-NB, it builds up a registry of all
the keys across all notebooks, so that you can then refer to them in the following ways:
You can paste it in markdown with a directive like this:
```{paste} your-key
```
Or you can add it in-line like this:
{paste}`your-key`
optionally:
{paste}`your-key:format-string`
See documentation for more details: https://myst-nb.readthedocs.io/en/latest/use/glue.html