%%% Section divider
% don't forget to \noindent the line after!
% \renewcommand\rule[2]{$\star$}
% \newcommand\secdiv{
%   \begin{center}
%     \rule{}{}
%   \end{center}
% }
\newcommand\secdiv{
  \begin{center}\rule{0.5\linewidth}{0.5pt}\end{center}
}