chore: Update Hugging Face dataset dashboard with total number of authors

app.py

@@ -1,7 +1,6 @@
 import gradio as gr
 import httpx
 from toolz import groupby
-from datetime import datetime
 import plotly.express as px
 import pandas as pd
 
@@ -19,6 +18,7 @@ def generate_dashboard(data, grouped, framework):
 
     dashboard = f"## Hugging Face Datasets for {framework} \n\n"
     dashboard += f"**Total number of datasets: {total_datasets}**\n\n"
+    dashboard += f"**Total number of authors: {len(grouped)}**\n\n"
     dashboard += "### Datasets per Author\n\n"
 
     for k, v in grouped.items():