🎨(frontend) Minor refactoring

- improve condition statements
- add "no-var" rule in eslint
- remove some unnecessary variables

Signed-off-by: Zorin95670 <moittie.vincent@gmail.com>

src/frontend/apps/impress/next.config.js

@@ -48,10 +48,7 @@ const nextConfig = {
           swDest: '../public/service-worker.js',
           include: [
             ({ asset }) => {
-              if (asset.name.match(/.*(static).*/)) {
-                return true;
-              }
-              return false;
+              return !!asset.name.match(/.*(static).*/);
             },
           ],
         }),