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

themes/docdock/exampleSite/content/content-organisation/extramenu.md

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+title = "Extra menu entries"
+date = "2017-04-29T18:36:24+02:00"
+Weight=2
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+
+You can define additional menu entries in the navigation menu without any link to content.
+
+Edit the website configuration `config.toml` and add a `[[menu.shortcuts]]` entry for each link your want to add.
+
+
+Example from the current website, **note the `pre` param** which allows you to insert HTML code and used here to separate content's menu from this "static" menu 
+
+	[[menu.shortcuts]]
+	pre = "<h3>More</h3>"
+	name = "<i class='fa fa-github'></i> Github repo"
+	identifier = "ds"
+	url = "https://github.com/vjeantet/hugo-theme-docdock"
+	weight = 1
+
+	[[menu.shortcuts]]
+	name = "<i class='fa fa-bookmark'></i> Hugo Documentation"
+	identifier = "hugodoc"
+	url = "https://gohugo.io/"
+	weight = 2
+
+
+[{{%icon circle-arrow-right%}} Read more about hugo and menu here](https://gohugo.io/extras/menus/)