Update docs/installing.md: create "Update Ansible roles" section

Also: mention running "just" role on maintainance

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/installing.md

@@ -4,7 +4,11 @@
 
 If you've [configured your DNS](configuring-dns.md) and have [configured the playbook](configuring-playbook.md), you can start the installation procedure.
 
-**Before installing** and each time you update the playbook in the future, you will need to update the Ansible roles in this playbook by running `just roles`. `just roles` is a shortcut (a `roles` target defined in [`justfile`](../justfile) and executed by the [`just`](https://github.com/casey/just) utility) which ultimately runs [agru](https://github.com/etkecc/agru) or [ansible-galaxy](https://docs.ansible.com/ansible/latest/cli/ansible-galaxy.html) (depending on what is available in your system) to download Ansible roles. If you don't have `just`, you can also manually run the `roles` commands seen in the `justfile`.
+## Update Ansible roles
+
+Before installing, you need to update the Ansible roles in this playbook by running `just roles`.
+
+`just roles` is a shortcut (a `roles` target defined in [`justfile`](../justfile) and executed by the [`just`](https://github.com/casey/just) utility) which ultimately runs [agru](https://github.com/etkecc/agru) or [ansible-galaxy](https://docs.ansible.com/ansible/latest/cli/ansible-galaxy.html) (depending on what is available in your system) to download Ansible roles. If you don't have `just`, you can also manually run the `roles` commands seen in the `justfile`.
 
 There's another shortcut (`just update`) which updates the playbook (`git pull`) and updates roles (`just roles`) at the same time.
 
@@ -90,7 +94,7 @@ After finilizing the installation, you can:
 
 ### Maintaining your setup in the future
 
-Feel free to **re-run the setup command any time** you think something is off with the server configuration. Ansible will take your configuration and update your server to match.
+Feel free to **re-run the setup command any time** you think something is off with the server configuration. Ansible will take your configuration and update your server to match. To update the playbook and the Ansible roles in the playbook, simply run `just roles`.
 
 Note that if you remove components from `vars.yml`, or if we switch some component from being installed by default to not being installed by default anymore, you'd need to run the setup command with `--tags=setup-all` instead of `--tags=install-all`. See [this page on the playbook tags](playbook-tags.md) for more information.