Queclinkdoc

The color of the search button changed from green to blue.

Changed the white text in the title area to light gray.

1. Changed the default background color of the title area to Blue (was Green), while allowing users to change to other colors via the theme option **toc_background_color** ;
2. Changed the font family and other styles, such as the `<cite>` tag is no longer bold, the `<code>` tag has removed the border, etc.

The labels at the top of the page suggest names prefixed with "headlabel-".

Reduce footnote font size to 0.7em.

Added theme option 'zoomout_asize', please see README for details.