[AAE-16219] Theming for HxP is not working (#8894)

lib/core/custom-theme/theme/theme-configuration.scss.tpl

@@ -1,14 +1,20 @@
 /*
-Specify theme parameters e.g.:
+    Replace 'THEME_CONFIGURATION' placeholder with your theme configuration using '$theme-config' variable map.
 
-$theme-config: (
-    primaryColor: #5175d2,
-    backgroundColor: #FAFAFA,
-    textColor: #793942,
-    accentColor: #C64F73,
-    baseFontSize: 26px,
-    fontFamily: Cursive
-);
+    Specify colors for palettes generation, e.g. if for 'primaryColor' the color is going to be 'red'(#fc0313).
+    Then, we are going to generate 'primary' palette based on the 'red' color.
+    Geenerated pallete is going to be used to create material design theme
+
+    e.g.
+
+    $theme-config: (
+        primaryColor: #5175d2,
+        backgroundColor: #FAFAFA,
+        textColor: #793942,
+        accentColor: #C64F73,
+        baseFontSize: 26px,
+        fontFamily: Cursive
+    );
 */
 
 ${THEME_CONFIGURATION}