Add galleries in targetconfig.

pxtarget.json

@@ -246,12 +246,6 @@
         "privacyUrl": "https://makecode.com/privacy",
         "termsOfUseUrl": "https://makecode.com/termsofuse",
         "githubUrl": "https://github.com/Microsoft/pxt-microbit",
-        "galleries": {
-            "Projects": "projects",
-            "Examples": "examples"
-        },
-        "projectGallery": "projects",
-        "exampleGallery": "examples",
         "crowdinProject": "kindscript",
         "boardName": "micro:bit",
         "driveDisplayName": "MICROBIT",

targetconfig.json

@@ -57,5 +57,9 @@
         "uk",
         "zh-CN",
         "zh-TW"
-    ]
+    ],
+    "galleries": {
+        "Projects": "projects",
+        "Examples": "examples"
+    }
 }

theme/blockly.less

@@ -19,3 +19,9 @@
     color: black;
     border-radius: 10px;
 }
+
+/* Led field editor */
+.blocklyLedOn {
+    stroke: white;
+    stroke-width: 1px;
+}