fix(samples): resolve images from root app

Update every Gradio example path for the consolidated root-level app so sample images resolve inside the Space repository again.

app.py

@@ -250,7 +250,7 @@ with gr.Blocks(title="NuMarkApp") as demo:
             [
                 "Basic receipt",
                 str(
-                    Path(__file__).parents[1]
+                    Path(__file__).parent
                     / "data"
                     / "samples"
                     / "receipt-ocr-original.webp"
@@ -261,7 +261,7 @@ with gr.Blocks(title="NuMarkApp") as demo:
             [
                 "Invoice with line items",
                 str(
-                    Path(__file__).parents[1]
+                    Path(__file__).parent
                     / "data"
                     / "samples"
                     / "invoice-with-items.png"
@@ -272,7 +272,7 @@ with gr.Blocks(title="NuMarkApp") as demo:
             [
                 "Advanced bank statement",
                 str(
-                    Path(__file__).parents[1]
+                    Path(__file__).parent
                     / "data"
                     / "samples"
                     / "BankStatementChequing.png"
@@ -283,7 +283,7 @@ with gr.Blocks(title="NuMarkApp") as demo:
             [
                 "Basic bank statement",
                 str(
-                    Path(__file__).parents[1]
+                    Path(__file__).parent
                     / "data"
                     / "samples"
                     / "bank statement blog image.webp"
@@ -300,7 +300,7 @@ with gr.Blocks(title="NuMarkApp") as demo:
                 ]
                 for path in sorted(
                     path
-                    for path in (Path(__file__).parents[1] / "data" / "samples").glob(
+                    for path in (Path(__file__).parent / "data" / "samples").glob(
                         "*.png"
                     )
                     if path.name