chore(docs.angularjs.org): actually fix deployment

When a file is symlinked, relative paths obviously aren't correct anymore.
This error was masked because Travis didn't fail the job when Firebase
couldn't find the public folder.
To fix, we copy the file and adjust the folder path

Gruntfile.js

@@ -479,7 +479,7 @@ module.exports = function(grunt) {
     'package',
     'compress:deployFirebaseCode',
     'copy:deployFirebaseCode',
-    'shell:symlink-firebase-docs',
+    'firebaseDocsJsonForTravis',
     'copy:deployFirebaseDocs'
   ]);
   grunt.registerTask('default', ['package']);

lib/grunt/plugins.js

@@ -62,4 +62,9 @@ module.exports = function(grunt) {
   grunt.registerTask('collect-errors', 'Combine stripped error files', function() {
     util.collectErrors();
   });
+
+  grunt.registerTask('firebaseDocsJsonForTravis', function() {
+    util.firebaseDocsJsonForTravis();
+  });
+
 };

lib/grunt/utils.js

@@ -292,5 +292,16 @@ module.exports = {
       }
       next();
     };
+  },
+
+  // Our Firebase projects are in subfolders, but Travis expects them in the root,
+  // so we need to modify the upload folder path and copy the file into the root
+  firebaseDocsJsonForTravis: function() {
+    var fileName = 'scripts/docs.angularjs.org-firebase/firebase.json';
+    var json = grunt.file.readJSON(fileName);
+
+    json.hosting.public = 'uploadDocs';
+
+    grunt.file.write('firebase.json', JSON.stringify(json));
   }
 };