A section can be added with `<tc:section/>` tag.

A section can have a title. It is added with the `label` attribute. This text is the content of a section.

    <tc:section label="Basics">

A section can contain one or more sections. In this example, the sections are cascaded to level six.

Level two. The section "Cascading" is level one.

Level three.

Level four.

Level five.

Level six.

A section can have an image in the header. The following section have pie-chart in the header.

    <tc:section label="Pie-Chart" image="fa-pie-chart">

It's also possible to use image files, instead of font awesome.

(TODO: currently not working!)