Update documentation for SchildiChat

Add "DNS", "Adjusting the playbook configuration", and "Installing"

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

docs/configuring-playbook-client-schildichat.md

@@ -6,17 +6,25 @@ SchildiChat can be installed alongside or instead of Element.
 
 **WARNING**: SchildiChat Web is based on Element-web, but its releases are lagging behind. As an example (from 2024-02-26), SchildiChat Web is 22 releases behind (it being based on element-web `v1.11.36`, while element-web is now on `v1.11.58`). Element-web frequently suffers from security issues, so running something based on an ancient Element-web release is **dangerous**. Use SchildiChat Web at your own risk!
 
+## DNS
 
-## Enabling SchildiChat
+You need to add a `schildichat.DOMAIN` DNS record so that SchildiChat can be accessed.
+By default SchildiChat will use https://schildichat.DOMAIN so you will need to create an CNAME record
+for `schildichat`. See [Configuring DNS](configuring-dns.md).
 
-If you'd like for the playbook to install SchildiChat, you can enable it in your configuration file (`inventory/host_vars/matrix.<your-domain>/vars.yml`):
+If you would like to use a different domain, add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file (changing it to use your preferred domain):
 
 ```yaml
-matrix_client_schildichat_enabled: true
+ matrix_server_fqn_schildichat: "sc.{{ matrix_domain }}"
 ```
 
+## Adjusting the playbook configuration
+
+To enable SchildiChat, add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file:
 
-## Configuring SchildiChat settings
+```yaml
+matrix_client_schildichat_enabled: true
+```
 
 The playbook provides some customization variables you could use to change schildichat's settings.
 
@@ -32,8 +40,7 @@ Alternatively, **if there is no pre-defined variable** for an schildichat settin
 
 - or, if extending the configuration is still not powerful enough for your needs, you can **override the configuration completely** using `matrix_client_schildichat_configuration_default` (or `matrix_client_schildichat_configuration`). You can find information about this in [`roles/custom/matrix-client-schildichat/defaults/main.yml`](../roles/custom/matrix-client-schildichat/defaults/main.yml).
 
-
-## Themes
+### Themes
 
 To change the look of schildichat, you can define your own themes manually by using the `matrix_client_schildichat_setting_defaults_custom_themes` setting.
 
@@ -42,3 +49,7 @@ Or better yet, you can automatically pull it all themes provided by the [aaronra
 If you make your own theme, we encourage you to submit it to the **aaronraimist/element-themes** project, so that the whole community could easily enjoy it.
 
 Note that for a custom theme to work well, all schildichat instances that you use must have the same theme installed.
+
+## Installing
+
+After configuring the playbook, run the [installation](installing.md) command: `just install-all` or `just setup-all`