docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-rules-rm.md

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+# filebrowser rules rm
+
+Remove a global rule or user rule
+
+## Synopsis
+
+Remove a global rule or user rule. The provided index
+is the same that's printed when you run 'rules ls'. Note
+that after each removal/addition, the index of the
+commands change. So be careful when removing them after each
+other.
+
+You can also specify an optional parameter (index_end) so
+you can remove all commands from 'index' to 'index_end',
+including 'index_end'.
+
+```
+filebrowser rules rm <index> [index_end] [flags]
+```
+
+## Options
+
+```
+  -h, --help         help for rm
+      --index uint   index of rule to remove
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+  -i, --id uint           id of user to which the rules apply
+  -u, --username string   username of user to which the rules apply
+```
+
+## See Also
+
+* [filebrowser rules](filebrowser-rules.md)	 - Rules management utility
+