Improve caching

router.js

@@ -1,10 +1,12 @@
 const router = require('koa-router')();
+const conditional = require('koa-conditional-get')();
+const etag = require('koa-etag')();
 const config = require('config');
 const pastes = require('./controllers/pastes');
 
 router
-	.get('/', async (ctx) => {
-		ctx.set('Cache-Control', 'no-cache');
+	.get('/', conditional, etag, async (ctx) => {
+		ctx.set('Cache-Control', 'public');
 
 		await ctx.render('index', {
 			pretty: config.prettyHtml,
@@ -15,6 +17,6 @@ router
 		});
 	})
 	.post('/', pastes.create)
-	.get('/:id', require('koa-conditional-get')(), require('koa-etag')(), pastes.view);
+	.get('/:id', conditional, etag, pastes.view);
 
 module.exports = router;