📝(frontend) Add change to changelog

Add PR title and ID to changelog Unreleased section

Signed-off-by: Paul Vernin <paul.vernin@gmail.com>

Author: pvrnn

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to
 - ♿️(frontend) announce formatting shortcuts for screen readers #2070
 - ✨(frontend) add markdown copy icon for Copy as Markdown option #2096
 - ♻️(backend) skip saving in database a document when payload is empty #2062
+- 💄(frontend) Use StyledLink for sub doc tree #2100
 
 ### Fixed