update readme for flyte 2 GA announcement

[cosmicBboy]

Update the README with Flyte 2 GA announcement

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.61%. Comparing base (b80a88a) to head (9369046).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #938   +/-   ##
=======================================
  Coverage   54.61%   54.61%           
=======================================
  Files         585      585           
  Lines       15390    15390           
  Branches     2831     2831           
=======================================
  Hits         8405     8405           
  Misses       6985     6985           

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