feat: notion loader (#405)

docs/advanced/data_types.mdx

@@ -54,6 +54,18 @@ To add any code documentation website as a loader, use the data_type as `docs_si
 app.add("docs_site", "https://docs.embedchain.ai/")
 ```
 
+### Notion
+To use notion you must install the extra dependencies with `pip install embedchain[notion]`.
+
+To load a notion page, use the data_type as `notion`.
+The next argument must **end** with the `notion page id`. The id is a 32-character string. Eg:
+
+```python
+app.add("notion", "cfbc134ca6464fc980d0391613959196")
+app.add("notion", "my-page-cfbc134ca6464fc980d0391613959196")
+app.add("notion", "https://www.notion.so/my-page-cfbc134ca6464fc980d0391613959196")
+```
+
 ### Text
 
 To supply your own text, use the data_type as `text` and enter a string. The text is not processed, this can be very versatile. Eg:

docs/advanced/query_configuration.mdx

@@ -46,6 +46,7 @@ Default values of chunker config parameters for different `data_type`:
 |pdf_file|1000|0|len|
 |youtube_video|2000|0|len|
 |docs_site|500|50|len|
+|notion|300|0|len|
 
 ### LoaderConfig