composer.json: improved description

composer.json

@@ -1,6 +1,7 @@
 {
 	"name": "nette/application",
-	"description": "Nette Application MVC Component",
+	"description": "🏆 A full-stack component-based MVC kernel for PHP that helps you write powerful and modern web applications. Write less, have cleaner code and your work will bring you joy.",
+	"keywords": ["nette", "mvc", "framework", "component-based", "routing", "seo", "mvp", "presenter", "control", "forms"],
 	"homepage": "https://nette.org",
 	"license": ["BSD-3-Clause", "GPL-2.0", "GPL-3.0"],
 	"authors": [