Adds JavaScript roadmap (#1537)

* Add JavaScript roadmap project file

* Make way for JavaScript roadmap

* Add JavaScript roadmap on homepage

* Add JavaScript roadmap image

* Add content skeleton for javascript roadmap

* Fix flicker issue on javascript roadmap

* Fix broken build

public/project/python.json

@@ -1897,7 +1897,7 @@
           "x": "337",
           "y": "1084",
           "properties": {
-            "controlName": "107-python-testing"
+            "controlName": "108-python-testing"
           },
           "children": {
             "controls": {