Revert short description (#733)

Author: ClementPasteau

__tests__/post-build/exampleShortHeaders.json.spec.js

@@ -33,7 +33,7 @@ describe('exampleShortHeaders.json post build checks', () => {
         name: 'Platformer',
         authorIds: ['R0F5QGNCzgOY5w2cxGeKJOq2UaD2'],
         shortDescription:
-          'An example of a basic platformer (Mario-like) game. Jump around and collect as many coins as you can!\n\nCheck out [the YouTube video](https://www.youtube.com/watch?v=eU0kkLSdw0Y&list=PL3YlZTdKiS898Wio0tvKjQM0x3zo4V0Mb) explaining how this example was made.',
+          'An example of a basic platformer (Mario-like) game. Jump around and collect as many coins as you can!',
         license: 'MIT',
         previewImageUrls: [
           'https://resources.gdevelop-app.com/examples/platformer/preview.png',

scripts/generate-database.js

@@ -379,9 +379,11 @@ const extractExamples = async (
         );
         const exampleName = formatExampleName(slug);
 
-        // Descriptions are short enough to be completely in the short description, avoiding to split them.
-        const shortDescription = readmeFileContent;
-        const description = '';
+        const shortDescription = readmeFileContent.split('\n\n')[0];
+        const description = readmeFileContent
+          .split('\n\n')
+          .slice(1)
+          .join('\n\n');
 
         const tags = [
           ...fileWithMetadata.tags,