\documentclass{article}

% Files
\usepackage[subpreambles=true]{standalone}
\usepackage{import}

\usepackage[T1]{fontenc} % encoding
\renewcommand{\familydefault}{\sfdefault} % sans-serif font

\usepackage[french]{babel} % langages
\frenchsetup{SmallCapsFigTabCaptions=false}

% Bibliography
\bibliographystyle{unsrt}
\nocite{*}

% Metadata
\def\docTitle{Title}
\def\docAuthor{Author}

% Dependencies
\usepackage[
  pdfauthor={\docAuthor},
  pdftitle={\docTitle},
  hidelinks,
]{hyperref}


\title{\docTitle}
\author{\docAuthor}
\date{}

\begin{document}

\maketitle
\flushbottom
\tableofcontents
\clearpage

\section{First section}
\import{sections/}{section1}

\section{Second section}
\import{sections/}{section2}

\section{Third section}
\import{sections/}{section3}

\clearpage
\appendix
\bibliography{sources}

\end{document}