Tag library name as `uni-3dar`

Combined with https://github.com/huggingface/huggingface.js/pull/1309, this will add a download counter + make the connection with the correct library on GitHub.

README.md

@@ -1,6 +1,6 @@
 ---
 license: mit
-library_name: transformers
+library_name: uni-3dar
 pipeline_tag: text-to-3d
 ---