\documentclass{book}

\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\usepackage[Lenny]{fncychap}

\renewcommand\contentsname{Table des mati\`eres}

\usepackage[colorlinks=true,
    linkcolor=red,
    urlcolor=blue,
    pdftitle={Dossier de Candidature},
    pdfauthor={Dimitrios S. Anagnostou}]{hyperref}

\usepackage{fancyhdr}

\fancypagestyle{mainmatter-pages}{%
  \fancyhf{}% Clear header/footer
  \renewcommand{\headrulewidth}{0pt}% Remove header rule
  \renewcommand{\footrulewidth}{0pt}% Remove footer rule
  \fancyfoot[L]{\hyperref[ToC-first-page]{Jump to Contents}}
  \fancyfoot[C]{\thepage}
}
\let\oldtableofcontents\tableofcontents
\renewcommand{\tableofcontents}{%
  \clearpage
  \phantomsection% Place hyperlink marker
  \label{ToC-first-page}% Set \label for hyperlink
  \oldtableofcontents
}
\let\oldmainmatter\mainmatter
\renewcommand{\mainmatter}{%
  \clearpage
  \oldmainmatter
  \pagestyle{mainmatter-pages}%
}

\usepackage[affil-it]{authblk}

\begin{document}

\title{DOSSIER DE CANDIDATURE}
\author{Dimitrios Papas\thanks{vbkvbkvbdkvbd}}

\affil{
Université\ldots}

\date{\begin{center}
Docteur en Mécanique
\end{center}}

\maketitle \thispagestyle{empty}

\frontmatter

\tableofcontents

\chapter*{Avant propos}
\addcontentsline{toc}{chapter}{Avant propos}
\lipsum

\mainmatter

\chapter{First}

\section{First section}
\lipsum

\chapter{Second}
\section{First section}
\lipsum

\end{document}