update readme link test (openvinotoolkit#947)

Author: eaidova

.ci/test_notebooks.py

@@ -35,18 +35,18 @@ def test_readme():
     """
     Test that all notebooks have a README file and exist in the Notebooks README
     """
-    notebooks_readme_path = Path("notebooks/README.md")
+    notebooks_readme_path = Path("README.md")
     notebooks_readme = notebooks_readme_path.read_text(encoding="utf-8")
     for item in Path("notebooks").iterdir():
         if item.is_dir():
             # item is a notebook directory
-            notebook_dir = item.relative_to("notebooks")
+            notebook_dir = item.relative_to(Path("notebooks"))
             if str(notebook_dir)[0].isdigit():
                 assert "README.md" in [
                     filename.name for filename in item.iterdir()
                 ], f"README not found in {item}"
                 assert (
-                    str(notebook_dir) in notebooks_readme
+                    str(item.relative_to(notebooks_readme_path.parent)) in notebooks_readme
                 ), f"{item} not found in notebooks README: {notebooks_readme_path}"