docs: ecosystem/integrations update 2 (#5282)

# docs: ecosystem/integrations update 2

#5219 - part 1 
The second part of this update (parts are independent of each other! no
overlap):

- added diffbot.md
- updated confluence.ipynb; added confluence.md
- updated college_confidential.md
- updated openai.md
- added blackboard.md
- added bilibili.md
- added azure_blob_storage.md
- added azlyrics.md
- added aws_s3.md

## Who can review?

@hwchase17@agola11
@agola11
 @vowelparrot
 @dev2049

docs/integrations/bilibili.md

@@ -0,0 +1,17 @@
+# BiliBili
+
+>[Bilibili](https://www.bilibili.tv/) is one of the most beloved long-form video sites in China.
+
+## Installation and Setup
+
+```bash
+pip install bilibili-api-python
+```
+
+## Document Loader
+
+See a [usage example](../modules/indexes/document_loaders/examples/bilibili.ipynb).
+
+```python
+from langchain.document_loaders import BiliBiliLoader
+```