Refactor theme configuration in app.py to simplify font settings.

app.py

@@ -61,10 +61,7 @@ hf_writer = HuggingFaceDatasetSaver(get_token(), dataset_name)
 flagged_counter = FlaggedCounter(dataset_name)
 
 
-theme = gr.themes.Default(
-    primary_hue=gr.themes.colors.indigo,
-    font=[gr.themes.GoogleFont("Saira"), gr.themes.GoogleFont("Source Sans Pro")],
-)
+theme = gr.themes.Default(primary_hue=gr.themes.colors.indigo)
 with gr.Blocks(theme=theme, css=css, title="SEA.AI Vision Demo") as demo:
     badges = gr.HTML(load_badges(flagged_counter.count()))
     title = gr.HTML(TITLE)