docs: consistent naming for configuration file (#2626)

* change all instances (file names and docs) of "config.template.yml" to "configuration.template.yml" so its consistent with the expectations of the Dockerfile

* Keep config.template.yml named as is

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>

* Update index.html

* revert filename changes and add a note about docker

* refactor: apply suggestions from code review

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>

README.md

@@ -354,4 +354,4 @@ for providing us with free licenses to their great tools.
 [Kubernetes]: https://kubernetes.io/
 [security]: https://github.com/authelia/authelia/security/policy
 [#support]: https://discord.com/channels/707844280412012608/707844280412012612
-[#contributing]: https://discord.com/channels/707844280412012608/804943261265297408
+[#contributing]: https://discord.com/channels/707844280412012608/804943261265297408

config.template.yml

@@ -4,6 +4,8 @@
 #                           Authelia Configuration                            #
 ###############################################################################
 
+## Note: the container by default expects to find this file at /config/configuration.yml.
+
 ## Certificates directory specifies where Authelia will load trusted certificates (public portion) from in addition to
 ## the system certificates store.
 ## They should be in base64 format, and have one of the following extensions: *.cer, *.crt, *.pem.

docs/configuration/index.md

@@ -27,13 +27,16 @@ You can have multiple configuration files which will be merged in the order spec
 the last one to be specified is the one that takes precedence. Example:
 
 ```console
-$ authelia --config config.yml --config config-acl.yml --config config-other.yml
+$ authelia --config configuration.yml --config config-acl.yml --config config-other.yml
-$ authelia --config config.yml,config-acl.yml,config-other.yml
+$ authelia --config configuration.yml,config-acl.yml,config-other.yml
 ```
 
 Authelia's configuration files use the YAML format. A template with all possible options can be found at the root of the 
 repository [here](https://github.com/authelia/authelia/blob/master/config.template.yml).
 
+### Docker
+By default, the container looks for a configuration file at `/config/configuration.yml`. This can be changed using the `command` setting.
+
 ## Environment
 You may also provide the configuration by using environment variables. Environment variables are applied after the 
 configuration file meaning anything specified as part of the environment overrides the configuration files. The 

internal/configuration/config.template.yml

@@ -4,6 +4,8 @@
 #                           Authelia Configuration                            #
 ###############################################################################
 
+## Note: the container by default expects to find this file at /config/configuration.yml.
+
 ## Certificates directory specifies where Authelia will load trusted certificates (public portion) from in addition to
 ## the system certificates store.
 ## They should be in base64 format, and have one of the following extensions: *.cer, *.crt, *.pem.

internal/suites/example/compose/nginx/backend/html/home/index.html

@@ -135,4 +135,4 @@
   </pre>
 </body>
 
-</html>
+</html>