Fix error and retire path

Author: ShawnKupfer

.openpublishing.redirection.json

@@ -44287,6 +44287,11 @@
       "source_path": "learn-pr/reactors/blockchain-learning-solidity/index.yml",
       "redirect_url": "https://learn.microsoft.com/training/browse/",
       "redirect_document_id": false
+    },
+    {
+      "source_path": "learn-pr/paths/ethereum-blockchain-development/index.yml",
+      "redirect_url": "https://learn.microsoft.com/training/browse/",
+      "redirect_document_id": false
     }
  ]
 }

learn-pr/achievements.yml

@@ -5330,3 +5330,8 @@ achievements:
   title: Connect and deploy to Ethereum networks
   summary: Learn about and use Ethereum networks for development, testing, and production.
   iconUrl: /training/achievements/reactors/blockchain-ethereum-networks.svg
+- uid: learn.ethereum-blockchain-development.trophy
+  type: trophy
+  title: Get started with blockchain development
+  summary: This learning path introduces you to blockchain and development on the Ethereum platform. Discover what skills are necessary to learn to begin building your own blockchain networks at scale.
+  iconUrl: /training/achievements/ethereum-blockchain-development.svg