Add more details to "What's new in 2.11"

Add a summary of the presentation content.  Also mention the 2.12
preview.

Change-Id: I5e7e1f8e92b1d5817db92a0ce5b1386ab396dc14
1 file changed
tree: e77f5a8eecc055e76afe866799daeea27e37d334
  1. images/
  2. conduct-policy.md
  3. index.md
  4. navbar.md
  5. sat.md
  6. sun.md
  7. welcome.md