Add school, educator and student grade levels to Homeroom page

[kevinrobinson]

Who is this PR for?

K8 educators

What problem does this PR fix?

Data quality issues around homeroom assignments and grade levels are a bit hidden. Related to #1939.

What does this PR do?

Adds in more info to the homeroom page, adjusts layout.

Screenshot (if adding a client-side feature)

before

after

Checklists

• Author checked latest in IE - Homeroom page
• Author included specs for new code

[kevinrobinson]

This PR also removes the link to the school page, and does the same for the profile v3 page. Only some users can access these right now. Later, we should update the school roster page to use the core authorizer code, and then we can allow anyone to use those pages (scoped to which students they have access to). Or we could rework those pages to be more meaningful (sort of a day-to-day overview of the school using pieces of the home page, feed and my students that we have now). But all out of scope for now, so removing the links.

[kevinrobinson]

selfie