Remove extensions and _cookiecutter from replay file

We always want to use the template provided extensions, keeping our own
list only makes it more likely to have errors when upgrading.

Also `_cookiecutter` is just noise, not very useful to keep.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.cookiecutter-replay.json

@@ -14,43 +14,6 @@
     "pypi_package_name": "frequenz-sdk",
     "github_repo_name": "frequenz-sdk-python",
     "default_codeowners": "@frequenz-floss/python-sdk-team",
-    "_extensions": [
-      "jinja2_time.TimeExtension",
-      "local_extensions.as_identifier",
-      "local_extensions.default_codeowners",
-      "local_extensions.github_repo_name",
-      "local_extensions.introduction",
-      "local_extensions.keywords",
-      "local_extensions.pypi_package_name",
-      "local_extensions.python_package",
-      "local_extensions.src_path",
-      "local_extensions.title"
-    ],
-    "_template": "gh:frequenz-floss/frequenz-repo-config-python",
-  },
-  "_cookiecutter": {
-    "Introduction": "{{cookiecutter | introduction}}",
-    "type": [
-      "actor",
-      "api",
-      "app",
-      "lib",
-      "model"
-    ],
-    "name": null,
-    "description": null,
-    "title": "{{cookiecutter | title}}",
-    "keywords": "(comma separated: 'frequenz', <type> and <name> are included automatically)",
-    "github_org": "frequenz-floss",
-    "license": [
-      "MIT",
-      "Proprietary"
-    ],
-    "author_name": "Frequenz Energy-as-a-Service GmbH",
-    "author_email": "[email protected]",
-    "python_package": "{{cookiecutter | python_package}}",
-    "pypi_package_name": "{{cookiecutter | pypi_package_name}}",
-    "github_repo_name": "{{cookiecutter | github_repo_name}}",
-    "default_codeowners": "(like @some-org/some-team; defaults to a team based on the repo type)"
+    "_template": "gh:frequenz-floss/frequenz-repo-config-python"
   }
 }