Note the cockpit side panels in the changelog

Co-authored-by: Manjunath Paparaju <[email protected]>

changelog.d/1739-cockpit-side-panels.md

@@ -0,0 +1,4 @@
+- Give the desktop cockpit the main page's side rails: Data Layers alone on the
+  left, and Display and Radio as a right rail that opens one panel at a time
+  beside it, at the same height, with Contact and Live Signals restyled to
+  match (manjunath22466, samehkhamis, #1739).