Miscellaneous doc updates and refactored team management doc. (#6730)

### What problem does this PR solve?

#5576, #6672

### Type of change


- [x] Documentation and UI Update

docs/guides/team/join_or_leave_team.md

@@ -0,0 +1,42 @@
+---
+sidebar_position: 2
+slug: /join_or_leave_team
+---
+
+# Join or leave a team
+
+Accept a team invite to join a team, decline a team invite, or leave a team.
+
+---
+
+Once you join a team, you can do the following:
+
+- Upload documents to the team owner's shared datasets (knowledge bases).
+- Update document configurations in the team owner's shared datasets.
+- Update the default configurations for the team owner's shared datasets.
+- Parse documents in the team owner's shared datasets.
+
+:::tip NOTE
+You cannot invite users to a team unless you are its owner.
+:::
+
+## Prerequisites
+
+1. Ensure that your Email address that received the team invitation is associated with a RAGFlow user account.
+2. To view and update the team owner's shared knowledge base, The team owner must set a knowledge base's **Permissions** to **Team**.
+
+## Accept or decline team invite
+
+Click on your avatar in the top right corner of the page, then select **Team** in the left-hand panel to access the **Team** page.
+
+![team](https://github.com/user-attachments/assets/0eac2503-26bc-4568-b3f2-bcd84069a07a)
+
+_On the **Team** page, you can view the information about members of your team and the teams you have joined._
+
+![accept_or_decline_team_invite](https://github.com/user-attachments/assets/6a2cb61f-03d5-4423-9ed1-71df97ff4114)
+
+_After accepting the team invite, you should be able to view and update the team owner's knowledge bases whose **Permissions** is set to **Team**._
+
+## Leave a joined team
+
+![Image](https://github.com/user-attachments/assets/4e4c6971-131b-490b-85d8-b362e0811b86)