Revert "Revert "Update index.md""

Yes. I'm stupid. Thx git.

This reverts commit 2e9a838b4f4275ff23b773806c9dcfa1d8b714de.
Revert "Added Upgrade Note for 1.0"

Hope I got the correct hash this time. Sorry for the history mess.

This reverts commit ec662ba25f61230854d6fbbd4706e503a1674c9e.