Roll pyharp and tidy the card description

app.py

@@ -61,16 +61,12 @@ threading.Thread(target=download_checkpoint, daemon=True).start()
 model_card = ModelCard(
     name="Instruct-MusicGen",
     description=(
-        (
-        (
         "Edits a music recording to follow a text instruction, e.g. adding, "
         "removing, or isolating an instrument. The code is Apache-2.0, but the "
         "model loads Meta's MusicGen weights, which are CC-BY-NC-4.0, so "
         "results cannot be used commercially. Repository: "
         "https://github.com/ldzhangyx/instruct-MusicGen Paper: "
         "https://arxiv.org/abs/2405.18386"
-        )
-        )
     ),
     author="Yixiao Zhang, Yukara Ikemiya, Woosung Choi, Naoki Murata, "
            "Marco A. Martinez-Ramirez, Liwei Lin, Gus Xia, Wei-Hsiang Liao, "