docs: update self-references to mlx-community after transfer

README.md

@@ -75,7 +75,7 @@ import soundfile as sf
 import mlx.core as mx
 from mlx_audio.tts.utils import load_model
 
-model = load_model("shreyask/svara-tts-v1")
+model = load_model("mlx-community/svara-tts-v1")
 
 chunks = []
 for result in model.generate(
@@ -97,7 +97,7 @@ sf.write("hello_hi.wav", np.asarray(audio), model.sample_rate)  # 24 kHz
 
 ```bash
 mlx_audio.tts.generate \
-    --model shreyask/svara-tts-v1 \
+    --model mlx-community/svara-tts-v1 \
     --text "नमस्ते, आप कैसे हैं?" \
     --voice "Hindi (Female)" \
     --temperature 0.75 \