Ensure admins have team-owner level access to all views in frontend

[knolleary]

Part of #940

(includes #987)

This takes advantage of how roles are defined in forge/lib/roles.js

const Roles = {
    None: 0,
    Member: 30,
    Owner: 50,
    Admin: 99
}

Rather than check role === Roles.Owner || role === Roles.Admin we can more concisely do role >= Roles.Owner.

[hardillb]

I had to look up what Teleport did, but the rest looks good.