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/confluence.md

@@ -0,0 +1,22 @@
+# Confluence
+
+>[Confluence](https://www.atlassian.com/software/confluence) is a wiki collaboration platform that saves and organizes all of the project-related material. `Confluence` is a knowledge base that primarily handles content management activities. 
+
+
+## Installation and Setup
+
+```bash
+pip install atlassian-python-api
+```
+
+We need to set up `username/api_key` or `Oauth2 login`. 
+See [instructions](https://support.atlassian.com/atlassian-account/docs/manage-api-tokens-for-your-atlassian-account/).
+
+
+## Document Loader
+
+See a [usage example](../modules/indexes/document_loaders/examples/confluence.ipynb).
+
+```python
+from langchain.document_loaders import ConfluenceLoader
+```