chore: improve build speed for stackblitz demos (#351)

Author: amcdnl

src/app/shared/stackblitz/stackblitz-writer.ts

@@ -14,7 +14,7 @@ const COPYRIGHT =
 const TEMPLATE_PATH = '/assets/stackblitz/';
 const TEMPLATE_FILES = [
   'index.html',
-  'styles.scss',
+  'styles.css',
   'polyfills.ts',
   '.angular-cli.json',
   'main.ts'

src/assets/stackblitz/.angular-cli.json

@@ -1,7 +1,7 @@
 {
   "apps": [{
     "styles": [
-      "styles.scss"
+      "styles.css"
       ]
   }]
 }