Move content from _manual/ to include/.

[ardour-manual] / include / interface-elements.html

<h2>Checkboxes</h2>
<h2>Buttons</h2>
<h2>Pull Down Menus</h2>
<h2>Pop Up Menus</h2>
<h2>Context Menus</h2>
<h2>Browsers</h2>