Check whether page is ready in _onInitWebWorker

Sometimes, InitWebWorker signal is called when
page is loaded and no windows's load or
document's DOMContentLoaded event is emitted.

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add panels If you use git, commit changes

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add plugin to Bootstrap admonitions

The Pelican plugin converts admonitions to Bootstrap 3 panels.

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>