Fix doc build warnings and errors

This change addresses the warnings and errors that are displayed when the
docs are built, including:

 * Add reference to previously unreferenced workflow_extend in index file
 * Remove reference to a _static directory that doesn't exist
 * Fix formatting issues within the workflow_extend document

Comments in the bug report discuss the need for warnings to be treated
as errors, but this does not seem to be possible using the setup.py build_sphinx
command.

Change-Id: Iccccb9d104df9847ecd8a52aa73a7aa450bb5f34
Partial-Bug: #1411719

doc/source/conf.py

@@ -274,7 +274,7 @@ html_theme_options = {
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = []
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.

doc/source/index.rst

@@ -76,6 +76,8 @@ Detailed tutorials to help you get started.
    tutorials/plugin
    tutorials/dashboard
    tutorials/table_actions
+   tutorials/workflow_extend
+
 
 Topic Guides
 ------------

doc/source/tutorials/workflow_extend.rst

@@ -8,7 +8,7 @@ custom data handling logic. Refer to inline documentation on what those
 properties and methods are.
 
 We highly recommend that you complete the
-:doc:``plugin tutorial </tutorials/plugin>`` if you have not done so already.
+:doc:`plugin tutorial </tutorials/plugin>` if you have not done so already.
 If you do not know how to package and install a plugin, the rest of this
 tutorial will not make sense! In this tutorial, we will examine an existing
 workflow and how we can extend it as a plugin.
@@ -27,6 +27,8 @@ Remember that the goal of this tutorial is to inject our custom step into an
 **existing** workflow. All of the files we are interested in reside in the
 ``static`` folder.
 
+::
+
   myplugin
   │
   ├── enabled
@@ -55,31 +57,32 @@ to do is inject it as a dependency and then use the methods provided in the
 extensible service to override or modify steps. In this example, we are going to
 prepend our custom step so that it will show up as the first step in the wizard.
 
-::
-(function () {
-  'use strict';
+.. code-block:: javascript
 
-  angular
-    .module('horizon.app.core.images')
-    .run(myPlugin);
+  (function () {
+    'use strict';
 
-  myPlugin.$inject = [
-    'horizon.app.core.images.basePath',
-    'horizon.app.core.images.workflows.create-volume.service'
-  ];
+    angular
+      .module('horizon.app.core.images')
+      .run(myPlugin);
 
-  function myPlugin(basePath, workflow) {
-    var customStep = {
-      id: 'mypluginstep',
-      title: gettext('My Step'),
-      templateUrl: basePath + 'steps/mystep/mystep.html',
-      helpUrl: basePath + 'steps/mystep/mystep.help.html',
-      formName: 'myStepForm'
-    };
-    workflow.prepend(customStep);
-  }
+    myPlugin.$inject = [
+      'horizon.app.core.images.basePath',
+      'horizon.app.core.images.workflows.create-volume.service'
+    ];
 
-})();
+    function myPlugin(basePath, workflow) {
+      var customStep = {
+        id: 'mypluginstep',
+        title: gettext('My Step'),
+        templateUrl: basePath + 'steps/mystep/mystep.html',
+        helpUrl: basePath + 'steps/mystep/mystep.help.html',
+        formName: 'myStepForm'
+      };
+      workflow.prepend(customStep);
+    }
+
+  })();
 
 ..  Note ::
 
@@ -104,7 +107,8 @@ In this example, we are listening for events generated by the wizard and the
 user panel. We also emit a custom event that other controllers can register to
 when favorite color changes.
 
-::
+.. code-block:: javascript
+
   (function() {
     'use strict';
 
@@ -171,7 +175,8 @@ simple example of a step that asks for your favorite color. The most important
 thing to note here is the reference to our controller via the ``ng-controller``
 directive. This is essentially the link to our controller.
 
-::
+.. code-block:: html
+
   <div ng-controller="horizon.app.core.images.steps.myStepController as ctrl">
     <h1 translate>Blue Plugin</h1>
     <div class="content">
@@ -199,4 +204,4 @@ Testing
 
 Now that we have completed our plugin, lets package it and test that it works.
 If you need a refresher, take a look at the installation section in
-:doc:`Plugin Tutorial </tutorial/plugin>`.
+:doc:`Plugin Tutorial </tutorials/plugin>`.