docs: add CLI usage and integrate generation in release

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

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+# filebrowser rules add
+
+Add a global rule or user rule
+
+## Synopsis
+
+Add a global rule or user rule.
+
+```
+filebrowser rules add <path|expression> [flags]
+```
+
+## Options
+
+```
+  -a, --allow   indicates this is an allow rule
+  -h, --help    help for add
+  -r, --regex   indicates this is a regex rule
+```
+
+## 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
+