Refactor the `meta/` repository to point to our Team Compass, and to be more "external facing".

Context

Now that we have a team compass (https://compass.executablebooks.org), we should re-work our executablebooks.org page to be more of a "landing page" for the executable books project. This will make it friendlier to external people interested in learning more, and can help distinguish internal team documents + policy, and external-facing information about the project.

Proposal

I propose that we move content in meta/ and team-compass/ to match their new roles. This has already been discussed elsewhere so my goal in this issue is just to provide a framework to help us know how to move things around.

meta/ (executablebooks.org) is an external landing page for the project. It should:

be geared towards external people that wish to learn more about the project
be a more user-friendly and condensed description of the policies and tools we have elsewhere
provide a high-level understanding of our stack and organization
be a router to other places with more information
have "blog-style" updates

team-compass/ (compass.executablebooks.org) is an internal policy page for the project. It should:

define our team policy
define our organizational structure, roles, etc
provide resources for pre-existing team members, as well as resources to help others contribute and become team members

Implementation

There are two PRs to implement this, both are here:

executablebooks / meta