Fix build script to properly add mobile apps

_build.js

@@ -17,7 +17,7 @@ const BUILD_SECTION = {
     webBasedProducts: () => generateCategorySection('Web-based products', readYaml()['web based products']),
     operatingSystems: () => generateCategorySection('Operating systems', readYaml()['operating systems']),
     desktopApps: () => generateCategorySection('Desktop apps', readYaml()['desktop applications']),
-    mobileApps: () => generateCategorySection('Mobile apps', readYaml()['desktop applications']),
+    mobileApps: () => generateCategorySection('Mobile apps', readYaml()['mobile applications']),
     hardware: () => generateCategorySection('Hardware', readYaml()['hardware']),
     useful: () => '# Useful links, tools, and advice',
     resources: () => readFile('md/_resources.md'),