docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-rules.md

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+# filebrowser rules
+
+Rules management utility
+
+## Synopsis
+
+On each subcommand you'll have available at least two flags:
+"username" and "id". You must either set only one of them
+or none. If you set one of them, the command will apply to
+an user, otherwise it will be applied to the global set or
+rules.
+
+## Options
+
+```
+  -h, --help              help for rules
+  -i, --id uint           id of user to which the rules apply
+  -u, --username string   username of user to which the rules apply
+```
+
+## 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 rules add](filebrowser-rules-add.md)	 - Add a global rule or user rule
+* [filebrowser rules ls](filebrowser-rules-ls.md)	 - List global rules or user specific rules
+* [filebrowser rules rm](filebrowser-rules-rm.md)	 - Remove a global rule or user rule
+