Cut v2.23.0 (#8223)

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

CHANGELOG.md

-## 2.23.0-rc.0 / 2020-11-23
+## 2.23.0 / 2020-11-26
 
 * [CHANGE] UI: Make the React UI default. #8142
 * [CHANGE] Remote write: The following metrics were removed/renamed in remote write. #6815

VERSION

-2.23.0-rc.0
+2.23.0