refactor: switched to less for css

- Added build setup to include styles.less in building community.css
- The old styles are still in style.css. Those styles will be slowly moved to style.less.
- Move all the new styles to style.less

community/public/build.json

@@ -3,6 +3,8 @@
     "public/css/lms.css"
   ],
   "css/community.css": [
-    "public/css/style.css"
+    "public/css/vars.css",
+    "public/css/style.css",
+    "public/css/style.less"
   ]
 }