Add course page to index

src/pages/courses/sql.astro

@@ -10,7 +10,6 @@ import SkeletonLayout from '../../layouts/SkeletonLayout.astro';
   description='Learn SQL from the ground up. This course covers the basics of SQL, intermediate concepts, and advanced topics.'
   keywords={['sql', 'database', 'database management', 'database administration']}
   canonicalUrl='/courses/sql'
-  noIndex={true}
 >
   <SQLCoursePage client:load />
 </SkeletonLayout>