common: split LaTeX customization

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
common: style: css: admonition

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>
common: style: add dialog icons

Signed-off-by: Stephan Linz <stephan.linz@clondiag.com>