docs: add organizations, provisioners, and premium license docs (#14778)

- [x] Mention Orgs is beta and add a link to get feedback
- [x] Add docs on new provisioner authentication architecture and
deprecate the old one
- [x] Add/update docs for IdP sync
  - [x] Organization Sync
  - [x] Group Sync
  - [x] Role Sync
- [x] Modify `coder.com` codebase to add `Premium` and `Beta` pill, and
allow multiple pills: https://github.com/coder/coder.com/pull/638
- [x] Replace all mentions of "Enterprise" with "Premium" in docs
  - [x] edit: change it to "Licensing"
- [x] Remove the enterprise page and change all links to
coder.com/pricing
- [x] Merge #14786
- [x] Add redirects for coder.com to redirect the `using-organizations`
guide to the new orgs one and /enterprise to /premium
https://github.com/coder/coder.com/pull/645
- [x] Custom roles
- [x] https://github.com/coder/coder/pull/14786
- [x] Remove all mentions of orgs experiment
- [x] Update in-product copy & links to link to the new docs pages

Anything I am missing?

---

[Preview
this](https://coder.com/docs/@orgs-licenses/admin/organizations)

---------

Co-authored-by: Edward Angert <EdwardAngert@users.noreply.github.com>
Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: Jaayden Halko <jaayden.halko@gmail.com>

docs/changelogs/v2.0.0.md

@@ -64,7 +64,7 @@ ben@coder.com!
   Stream Kubernetes event logs to the Coder agent logs to reveal Kuernetes-level
   issues such as ResourceQuota limitations, invalid images, etc.
   ![Kubernetes quota](https://raw.githubusercontent.com/coder/coder/main/docs/platforms/kubernetes/coder-logstream-kube-logs-quota-exceeded.png)
-- [OIDC Role Sync](https://coder.com/docs/admin/auth#group-sync-enterprise)
+- [OIDC Role Sync](https://coder.com/docs/admin/auth#group-sync-enterprise-premium)
   (Enterprise): Sync roles from your OIDC provider to Coder roles (e.g.
   `Template Admin`) (#8595) (@Emyrk)
 - Users can convert their accounts from username/password authentication to SSO