docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-users-import.md

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+# filebrowser users import
+
+Import users from a file
+
+## Synopsis
+
+Import users from a file. The path must be for a json or yaml
+file. You can use this command to import new users to your
+installation. For that, just don't place their ID on the files
+list or set it to 0.
+
+```
+filebrowser users import <path> [flags]
+```
+
+## Options
+
+```
+  -h, --help        help for import
+      --overwrite   overwrite users with the same id/username combo
+      --replace     replace the entire user base
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser users](filebrowser-users.md)	 - Users management utility
+