\documentclass{lxarticle}
\usepackage{german}
\usepackage[utf8]{inputenc}
\usepackage{lxheaders}
\usepackage{lxextras}
\lstset{keywordstyle=\color{blue}}

\begin{document}

% disables chapter, section and subsection numbering
\setcounter{secnumdepth}{-1}

\input{section}