MDL-61460 tool_componentlibrary: Documentation for Moodle UI components

- This tool is only available for admins
- Before using this tool the hosting admin will need to have NPM installed and be able to run grunt
- To create the docs pages for the library run "grunt componentlibrary"
- After the pages are created the Library is available in Site adminstration > Development > UI Component Library

.grunt/tasks/componentlibrary.js

@@ -129,6 +129,9 @@ module.exports = grunt => {
         },
     });
 
+    // Add the 'componentlibrary' task as a startup task.
+    grunt.moodleEnv.startupTasks.push('componentlibrary');
+
     return {
         docsBuild,
         cssBuild,

.grunt/tasks/ignorefiles.js

@@ -50,6 +50,7 @@ module.exports = grunt => {
             'theme/boost/style/moodle.css',
             'theme/classic/style/moodle.css',
             'jsdoc/styles/*.css',
+            'admin/tool/componentlibrary/hugo/dist/css/docs.css',
         ].concat(thirdPartyPaths);
         grunt.file.write('.stylelintignore', stylelintIgnores.join('\n') + '\n');
     };