[New] Beehiiv loader (#963)

docs/data-sources/beehiiv.mdx

@@ -0,0 +1,16 @@
+---
+title: "🐝 Beehiiv"
+---
+
+To add any Beehiiv data sources to your app, just add the base url as the source and set the data_type to `beehiiv`.
+
+```python
+from embedchain import Pipeline as App
+
+app = App()
+
+# source: just add the base url and set the data_type to 'beehiiv'
+app.add('https://aibreakfast.beehiiv.com', data_type='beehiiv')
+app.query("How much is OpenAI paying developers?")
+# Answer: OpenAI is aggressively recruiting Google's top AI researchers with offers ranging between $5 to $10 million annually, primarily in stock options.
+```