docs: add goals and intro for conformance profiles GEP

[shaneutt]

What type of PR is this?

/kind gep

What this PR does / why we need it:

This is one of several issues needed in support of #1709.

This is meant to be a small initial iteration to make sure we have alignment on the "what" and "why" by way of the tldr, goals and introduction, but not bothering yet with the how. The hope is that if we have alignment follow up iterations can be responsible for filling in the "how". Please feel very free to add suggestions for anything you want to see changed or added, I want to incorporate and co-author this with anyone with ideas and interest.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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[youngnick]

This LGTM as starting point, thanks @shaneutt!

[Xunzhuo]

LGTM, thanks @shaneutt!

[LiorLieberman]

I like the idea of splitting it to iterations, thanks @shaneutt !
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: LiorLieberman, shaneutt, Xunzhuo

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[shaneutt]

Forgot to put a hold on this to allow @robscott and/or @youngnick to give it a look. Please do one or both of you check it out, but given that it's provisional I think it's reasonable to make small PRs for any changes or adjustments desired now, rather than reverting?

[youngnick]

That sounds fine to me.

[robscott]

Thanks @shaneutt! LGTM other than one small nit that can be a follow up.

[robscott]

Needs a link in mkdocs.yml since we haven't automated this yet.

[shaneutt]

Will follow up, thank you 👍