Move details of how the Team evaluates charters to the guide

[frivoal]

This is similar to how we move the Team's evaluation criteria for Member submissions to the Guide.

---

Preview | Diff

[frivoal]

This is the minimalist version of this PR. We could choose to keep a little more in the Process (for instance, for Member submissions we kept the IPR clauses), but this is what it looks like if we move it all to the guide. Of course, we actually need to populate that guide article.

[fantasai]

I think we should follow the model we did for Member Submissions, which is to keep the high-level ideas of what the Team should be evaluating in the Process (scope, quality, mission-alignment, etc.), and leave the details to the Guide.

[tantek]

I liked the prior language but I'm also ok with deferring to referring to the Guide for this.