revert: restore devcontainer.json, .env.example, README.md, local_development.md to origin/dev state

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Harmanpreet-Microsoft

.devcontainer/devcontainer.json

@@ -10,6 +10,5 @@
         "ghcr.io/azure/azure-dev/azd:latest": {},
         "ghcr.io/devcontainers/features/azure-cli:1": {},
         "ghcr.io/devcontainers/features/powershell:2.0.0": {}
-    },
-    "postCreateCommand": "git submodule update --init --recursive && pwsh ./scripts/validate-prerequisites.ps1 -SkipAzureChecks"
+    }
 }

.env.example

@@ -272,7 +272,6 @@ Supporting documentation
 
 | Document | Description |
 |----------|-------------|
-| [Local Development Setup](./docs/local_development.md) | Set up your local environment, validate prerequisites, and deploy |
 | [Deployment Guide](./docs/deploymentguide.md) | Complete deployment instructions |
 | [Post Deployment Steps](./docs/post_deployment_steps.md) | Verify your deployment |
 | [PostgreSQL Mirroring](./docs/postgresql_mirroring.md) | Automate or troubleshoot the Fabric connection and PostgreSQL mirror flow |