Add keywords to frontend roadmap

content/roadmaps.json

@@ -4,6 +4,10 @@
       "title": "Learn to become a modern frontend developer",
       "description": "Community driven, articles, resources, guides, interview questions, quizzes for modern frontend development. Learn to become a modern frontend developer by following the steps, skills, resources and guides listed in this roadmap.",
       "keywords": [
+        "frontend roadmap",
+        "javascript roadmap",
+        "frontend roadmap 2021",
+        "javascript roadmap 2021",
         "guide to becoming a developer",
         "guide to becoming a frontend developer",
         "frontend developer",
@@ -281,4 +285,4 @@
     },
     "id": "qa"
   }
-]
+]