MDL-79003 js: Use our own jsdoc wrapper

grunt-jsdoc is abandoned and only works with an older version of jsdoc.

This is a very simple wrapper around jsdoc itself.

This commit also includes a fix for broken docs.

.grunt/tasks/jsdoc.js

@@ -20,17 +20,33 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-module.exports = grunt => {
-    // Project configuration.
-    grunt.config.merge({
-        jsdoc: {
-            dist: {
-                options: {
-                    configure: ".grunt/jsdoc/jsdoc.conf.js",
-                },
-            },
-        },
-    });
+module.exports = (grunt) => {
+    const path = require('path');
+
+    grunt.registerTask('jsdoc', 'Generate JavaScript documentation using jsdoc', function() {
+        const done = this.async();
+        const configuration = path.resolve('.grunt/jsdoc/jsdoc.conf.js');
 
-    grunt.loadNpmTasks('grunt-jsdoc');
+        grunt.util.spawn({
+            cmd: 'jsdoc',
+            args: [
+                '--configure',
+                configuration,
+            ]
+        }, function(error, result, code) {
+            if (result.stdout) {
+                grunt.log.write(result.stdout);
+            }
+
+            if (result.stderr) {
+                grunt.log.error(result.stderr);
+            }
+            if (error) {
+                grunt.fail.fatal(`JSDoc failed with error code ${code}`);
+            } else {
+                grunt.log.write('JSDoc completed successfully'.green);
+            }
+            done();
+        });
+    });
 };