text: Title: Populate Slack Welcome message
  Body: Context:
  Currently, we will send the user a welcome message when user joins the Ploomber Slack Workspace.
  We may consider to provide the list of our current links.
  
  Example - Ideal After:
  <img width="768" alt="Screenshot 2023-01-02 at 9 26 32 PM" src="https://user-images.githubusercontent.com/9766828/210292932-b20a7a26-8591-4dd0-b1ce-95ff5fa4efd8.png">
  
  Example - Currently Implementation:
  <img width="901" alt="Screenshot 2023-01-02 at 9 30 49 PM" src="https://user-images.githubusercontent.com/9766828/210293134-f2b0e0d1-1948-4e2d-b494-fdca8440642a.png">
  
  
  
  Action Item:
  
  - [ ] Discuss if providing those links will help users to find the resource easier
    - What to include in the list? Currently we can have Ploomber.io, Github link, Doc link, Blog link
  - [ ] Modify the bot message with the new adding section