Revert "fix: course length"

This reverts commit 40c7ea1b43.

src/pages/[roadmapId]/projects.astro

@@ -75,6 +75,7 @@ const { response: userCounts } =
   resourceType='roadmap'
 >
   <div class='bg-gray-50'>
+    <!-- // TODO: get courses count -->
     <RoadmapHeader
       title={title}
       description={description}
@@ -83,7 +84,7 @@ const { response: userCounts } =
       isForkable={true}
       activeTab='projects'
       projectCount={projects.length}
-      coursesCount={roadmapData.courses?.length || 0}
+      coursesCount={0}
       hasAIChat={true}
     />