added file config example. Linked the example in navigation.
MODIFY
docs/modules/ROOT/nav.adoc
docs/modules/ROOT/nav.adoc
*** xref:installation/advanced/multi.adoc[Multiple Operators]
* Command Line Interface
** xref:cli/cli.adoc[Kamel CLI]
+** xref:cli/file-based-config.adoc[File-based Config]
** xref:cli/modeline.adoc[Modeline]
* xref:running/running.adoc[Run an Integration]
** xref:running/dev-mode.adoc[Developer mode]

MODIFY
docs/modules/ROOT/pages/cli/file-based-config.adoc
docs/modules/ROOT/pages/cli/file-based-config.adoc
File-based configuration is used to set command flags. Flag values do not need to be entered on a regular basis. The file is read on Kamel startup and the flags are set accordingly.
-To configure this flag, create a file named kamel-config.yaml on the same directory as your integration. The file must contain a yaml structure as shown in ./kamel-config.yaml.
\ No newline at end of file
+The file's default name is `kamel-config.yaml` . Which should be placed in either of this directory structure:
+
+ - `~/.kamel/`
+ - `./.kamel/`
+ - `.`
+
+it can be overriden by setting an env value `KAMEL_CONFIG_NAME` to file path.
+
+
+To configure this flag, create a file named kamel-config.yaml on the same directory as your integration. The file must contain a yaml structure as shown below:
+
+.Kamel-config.yaml
+
+```yaml
+kamel:
+ install:
+ namespace: kamel
+ healthPort: 8081
+ monitoringPort: 8082
+```

added file config example. Linked the example in navigation.