fix: restore renovate.json to correct configuration

The file was accidentally corrupted with devcontainer.json content.
Restoring to the simple configuration that extends from shared config.

Author: aquemy

renovate.json

@@ -1,41 +1,6 @@
 {
-    "name": "StreamBlocks Development",
-    "image": "mcr.microsoft.com/devcontainers/python:3.13",
-    "features": {
-        "ghcr.io/devcontainers/features/node:1": {
-            "version": "lts"
-        }
-    },
-    "customizations": {
-        "vscode": {
-            "extensions": [
-                "ms-python.python",
-                "ms-python.vscode-pylance",
-                "charliermarsh.ruff",
-                "tamasfe.even-better-toml",
-                "redhat.vscode-yaml",
-                "github.copilot",
-                "eamodio.gitlens"
-            ],
-            "settings": {
-                "python.defaultInterpreterPath": ".venv/bin/python",
-                "python.terminal.activateEnvironment": true,
-                "[python]": {
-                    "editor.defaultFormatter": "charliermarsh.ruff",
-                    "editor.formatOnSave": true,
-                    "editor.codeActionsOnSave": {
-                        "source.fixAll": "explicit",
-                        "source.organizeImports": "explicit"
-                    }
-                },
-                "ruff.organizeImports": true,
-                "python.analysis.typeCheckingMode": "strict"
-            }
-        }
-    },
-    "postCreateCommand": "pip install uv && uv sync --all-groups && npm install -g @evilmartians/lefthook && lefthook install",
-    "containerEnv": {
-        "UV_LINK_MODE": "copy"
-    },
-    "remoteUser": "vscode"
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>hotherio/config-renovate"
+  ]
 }