docs: restructure docs (#14421)

Closes #13434 
Supersedes #14182

---------

Co-authored-by: Ethan <39577870+ethanndickson@users.noreply.github.com>
Co-authored-by: Ethan Dickson <ethan@coder.com>
Co-authored-by: Ben Potter <ben@coder.com>
Co-authored-by: Stephen Kirby <58410745+stirby@users.noreply.github.com>
Co-authored-by: Stephen Kirby <me@skirby.dev>
Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: Edward Angert <EdwardAngert@users.noreply.github.com>

docs/admin/users/password-auth.md

@@ -0,0 +1,27 @@
+# Password Authentication
+
+Coder has password authentication enabled by default. The account created during
+setup is a username/password account.
+
+## Disable password authentication
+
+To disable password authentication, use the
+[`CODER_DISABLE_PASSWORD_AUTH`](../../reference/cli/server.md#--disable-password-auth)
+flag on the Coder server.
+
+## Restore the `Owner` user
+
+If you remove the admin user account (or forget the password), you can run the
+[`coder server create-admin-user`](../../reference/cli/server_create-admin-user.md)command
+on your server.
+
+> Note: You must run this command on the same machine running the Coder server.
+> If you are running Coder on Kubernetes, this means using
+> [kubectl exec](https://kubernetes.io/docs/reference/kubectl/generated/kubectl_exec/)
+> to exec into the pod.
+
+## Reset a user's password
+
+An admin must reset passwords on behalf of users. This can be done in the web UI
+in the Users page or CLI:
+[`coder reset-password`](../../reference/cli/reset-password.md)