feat: Move all Binder config files to binder directory

[matthewfeickert]

• Add binder directory to make it clear to Binder where to find files.
• Move requirements.txt to binder/ and then symlink back to top level for user ease of use.
  • c.f. feat: Add Binder support phinate/differentiable-analysis-examples#1 for an example
• Add binder/runtime.txt to specify a Python runtime of Python 3.10.

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[matthewfeickert]

@klieret this is ready for review. This can provide Binder stability by specifying more of the runtime.

[amangoel185]

@matthewfeickert, would it be better to update the Binder (and SWAN) link too? Currently points to @plttraining (https://mybinder.org/v2/gh/plttraining/hsf_matplotlib_notebooks/main) since it was ported to @hsf-training from there.

They work well already though!

[matthewfeickert]

@amangoel185 Done now with

git grep --name-only "plttraining" | xargs sed -i "s/plttraining/hsf-training/g"

so should have gotten everything.

[amangoel185]

Looks great, thank you! :)

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