Communicate new website

[elycheea]

Followup to #4622
Need to figure out actual timing for when to publish
REF #5344 (roadmap plan)

Dev

Beta Give feedback

1. Migrate existing issues to new repo
2. Define what is the minimum requirement of content updates for us to launch
3. Add notice to README directing users to new repo
4. Disable repo issues (only after notification has been added)
5. How to add notice to old website to move to new website #5728
   role: design role: dev +2
   

Design

Beta Give feedback

1. Design notice for old website
2. Draft Slack comms for new website #5731
   role: design +1
   
3. [Website] Draft outline for DSAG and IDL presentation #5730
   2 of 3
   role: design +1
   

[ljcarot]

@elycheea One dev task remains about updating the README. Do you know if that was done?

[elycheea]

@ljcarot It was done! Included it in the notification PR.
https://github.ibm.com/cdai-design/pal#readme