chore(icons): contribute to #2397 by improving the comment instructions

src/Utils/Icon.hs

@@ -30,7 +30,11 @@ type WidgetSiteless = forall site. WidgetFor site ()
 -- For consistency, some conditional icons are also provided, having suffix True/False
 
 ---------------------------------------------------------------------------
--- IMPORTANT: Alert-Icons must be registered in alert-icons.js as well!!!
+-- IMPORTANT:
+-- All icons must be manually registered within the following files:
+--  - src/Utils/Icon.hs
+--  - assets/icon-src/fontawesome.json
+--  - frontend/src/icons.scss
 ---------------------------------------------------------------------------
 data Icon
   = IconNew
@@ -40,7 +44,7 @@ data Icon
   | IconProblem
   | IconVisible
   | IconInvisible
-  -- | IconCourse -- not used, IconMenuCourse is currently only used 
+  -- | IconCourse -- not used, IconMenuCourse is currently only used
   | IconCourseFavouriteManual | IconCourseFavouriteAutomatic | IconCourseFavouriteOff
   | IconEnrolTrue
   | IconEnrolFalse
@@ -118,13 +122,13 @@ data Icon
   | IconCompany
   | IconEdit
   | IconUserEdit
-  
+
   deriving (Eq, Ord, Enum, Bounded, Show, Read, Generic)
   deriving anyclass (Universe, Finite, NFData)
 
 
 iconText :: Icon -> Text
-iconText = camelToPathPiece' 1 . tshow 
+iconText = camelToPathPiece' 1 . tshow
 
 nullaryPathPiece ''Icon $ camelToPathPiece' 1
 deriveLift ''Icon
@@ -140,7 +144,7 @@ icon ic = [shamlet|
             <span .ico-#{iconText ic}>
           |]
 
-  
+
 -- Create an icon with fixed width
 iconFixed :: Icon -> Markup
 iconFixed ic = [shamlet|