Kernel docs followups

[sayakpaul]

• Move to a fully Jinja-based template and remove re based parsing.
• Decouple commands into two: kernels init-card and kernels fill-card.
• Make kernel card generation a part of kernels upload (and test).
• Add an entry for generating kernel system cards to the "writing kernels" tutorial.

[HuggingFaceDocBuilderDev]

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[sayakpaul]

@danieldk I have broken the create-and-upload-card command into two simpler commands as we discussed internally. I would like to get a review on the progress made so far before making further changes (docs, etc.).

Would like to open a PR to this PR branch for nix build . so that the card generation process gets included in its execution? That way, once kernels upload is issued, the card also gets uploaded to the build repo.

[sayakpaul]

@danieldk @drbh a couple of updates here:

• Broadly, it's now decoupled into two commands: kernels init-card ... and kernels fill-card.
• Existing user section preserved whilst build-based info is always updated when relevant.

Question:

Do we have to assume "build" directory exists within a kernel source directory? Asking because it seems like we can initialize and serialize the kernel card as "CARD.md" in the top-level kernel source dir and then fill it up based on the information available from build.toml.

[sayakpaul]

I have updated the PR in accordance with #287 (comment).

@drbh @danieldk PTAL when you have time.

[danieldk]

Looks great! One small typo, but good to merge after that.