MAINT: Harmonise GPU admonition, remove backend checks + add nvidia-smi

[mmcky]

This PR:

• adds GPU admonition from https://manual.quantecon.org/styleguide/code.html#jax
• removes code snippets for checking the gpu backend (and added to status.md)
• add nvidia-smi to make hardware more visible to readers (testing in wealth_dynamics lecture)

cc: @jstac

• review build in the morning before merging

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[mmcky]

@HengchengZhang is there a way to fix

(           intro: line   18) broken    https://quantecon.org/projects/#filter=lecture - Anchor 'filter=lecture' not found

I added this link to replace the old one on the intro page but it uses an anchor to run a query.

[HengchengZhang]

Hi @mmcky, I'm not sure where this link should be directed to. Is that https://quantecon.org/python-lectures/?

[mmcky]

Hi @mmcky, I'm not sure where this link should be directed to. Is that https://quantecon.org/python-lectures/?

Sorry @HengchengZhang -- I wasn't clear. The link is correct but needs the anchor. Will that cause problems with the sphinx linkchecker from your investigations?

[mmcky]

@jstac as this impacts widely I will merge this now. I'll help with any merge conflict on #49

[HengchengZhang]

That should not be the problem with link checker, our QuantEcon links only returns error when it's actually broken.

So I think there's something wrong with this anchor or the use of anchor?