fix: changed tag to layer 2

Author: PatrickAlphaC

src/data/externalTutorials.json

@@ -6,8 +6,7 @@
     "author": "Patrick Collins",
     "authorGithub": "https://github.com/PatrickAlphaC",
     "tags": [
-      "rollups",
-      "blobs"
+      "layer 2"
     ],
     "skillLevel": "intermediate",
     "timeToRead": "660",
@@ -21,8 +20,7 @@
     "author": "Patrick Collins",
     "authorGithub": "https://github.com/PatrickAlphaC",
     "tags": [
-      "rollups",
-      "blobs"
+      "layer 2"
     ],
     "skillLevel": "intermediate",
     "timeToRead": "600",