Convert docdock theme from submodule to native files and fix Hugo compatibility

themes/docdock/exampleSite/content/shortcodes/alert.md

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+title = "alert"
+description = "The alert shortcode allows you to highlight information in your page."
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+
+The `alert` shortcode allow you to highlight information in your page. They create a colored box surrounding your text, like this:
+
+{{%alert%}}**This is** an alert !{{%/alert%}}
+## Usage 
+
+| Parameter | Default | Description |
+|:--|:--|:--|
+| theme | `info` | `success`, `info`,`warning`,`danger` |
+
+{{%alert info%}}
+**Tips :** setting only the theme as argument works too : 
+`{{%/*alert warning*/%}}`  instead of `{{%/*alert theme="warning"*/%}}`
+{{%/alert%}}
+
+## Basic examples
+
+	{{%/* alert theme="info" */%}}**this** is a text{{%/* /alert */%}}
+	{{%/* alert theme="success" */%}}**Yeahhh !** is a text{{%/* /alert */%}}
+	{{%/* alert theme="warning" */%}}**Be carefull** is a text{{%/* /alert */%}}
+	{{%/* alert theme="danger" */%}}**Beware !** is a text{{%/* /alert */%}}
+
+{{% alert theme="info"%}}**this** is an info{{% /alert %}}
+{{% alert theme="success" %}}**Yeahhh !** is an success{{% /alert %}}
+{{% alert theme="warning" %}}**Be carefull** is a warning{{% /alert %}}
+{{% alert theme="danger" %}}**Beware !** is a danger{{% /alert %}}