rollback changes not related to actual "preview" FE environment

Makefile

@@ -6,10 +6,10 @@
 VERSION ?= 0.0.1
 
 # CHANNELS define the bundle channels used in the bundle.
-# Add a new line here if you would like to change its default config. (E.g CHANNELS = "fast,stable")
+# Add a new line here if you would like to change its default config. (E.g CHANNELS = "preview,fast,stable")
 # To re-generate a bundle for other specific channels without changing the standard setup, you can:
-# - use the CHANNELS as arg of the bundle target (e.g make bundle CHANNELS=fast,stable)
-# - use environment variables to overwrite this value (e.g export CHANNELS="fast,stable")
+# - use the CHANNELS as arg of the bundle target (e.g make bundle CHANNELS=preview,fast,stable)
+# - use environment variables to overwrite this value (e.g export CHANNELS="preview,fast,stable")
 ifneq ($(origin CHANNELS), undefined)
 BUNDLE_CHANNELS := --channels=$(CHANNELS)
 endif