add documentation for toc and toc-tree shortcode

exampleSite/content/shortcodes/toc-tree.md

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+The toc-tree shortcode will generate a Table of Content from a section filetree of your content directory. The root of the resulting ToC will be the page on which you define the shortcode.
+
+```tpl
+{{</* toc-tree */>}}
+```
+
+## Example
+
+As said, the root will be the site on which the shortcode was used, you can see a demo including nesting in the [ToC Tree](/toc-tree) section.

exampleSite/content/shortcodes/toc.md

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+Simple wrapper to generate a page Table of Content from a shortcode.
+
+```tpl
+{{</* toc */>}}
+```
+
+{{< toc >}}
+
+## Level 1
+
+## Level 2
+
+### Level 2.1
+
+### Level 2.2
+
+