docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-config.md

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+# filebrowser config
+
+Configuration management utility
+
+## Synopsis
+
+Configuration management utility.
+
+## Options
+
+```
+  -h, --help   help for config
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser](filebrowser.md)	 - A stylish web-based file browser
+* [filebrowser config cat](filebrowser-config-cat.md)	 - Prints the configuration
+* [filebrowser config export](filebrowser-config-export.md)	 - Export the configuration to a file
+* [filebrowser config import](filebrowser-config-import.md)	 - Import a configuration file
+* [filebrowser config init](filebrowser-config-init.md)	 - Initialize a new database
+* [filebrowser config set](filebrowser-config-set.md)	 - Updates the configuration
+