Sort examples that are not starters nor game by presence of thumbnails (#628)

Don't show in changelog

Author: AlexandreSi

scripts/generate-database.js

@@ -417,6 +417,18 @@ const extractExamples = async (
   };
 };
 
+/**
+ * @param {ExampleShortHeader} example1
+ * @param {ExampleShortHeader} example2
+ * @returns {number}
+ */
+const examplePreviewImageSortingFunction = (example1, example2) => {
+  const difference =
+    (example2.previewImageUrls.length ? 1 : 0) -
+    (example1.previewImageUrls.length ? 1 : 0);
+  return difference;
+};
+
 /**
  * Update the example game files to use resources on resources.gdevelop-app.com
  * @param {libGDevelop} gd
@@ -484,6 +496,10 @@ const generateSortedShortHeaders = (allExamples) => {
     );
   });
 
+  examplesWithNeitherStarterNorGameTags.sort(
+    examplePreviewImageSortingFunction
+  );
+
   return [
     ...sortedStarters,
     ...examplesWithGameTag,