\documentclass[aspectratio=169, 10pt]{beamer}
\usetheme{gotham}

   \gothamset{
      numbering= framenumber,
      % tocframe template= gotham simple,
      parttocframe default=off,
      sectiontocframe default=off,
      subsectiontocframe default=off,
   }

	\usepackage{standalone}
	\usepackage{tikz}
	\usepackage{pgfplots}
	\usepackage{tabularray} % Typeset tabulars and arrays (contains equivalent of longtable, booktabs and dcolumn at least) 
		\UseTblrLibrary{booktabs} % to load extra commands from booktabs
   \usepackage{changepage}

   \usepackage{appendixnumberbeamer}
   \usepackage[scale=2]{ccicons}
   % \usepackage{pgfplots}
      \usepgfplotslibrary{dateplot}

   \newcommand{\themename}{\textbf{\textsc{Gotham}}}


\title[]{Gotham}
\subtitle{A Modern, versatile and extendable theme for Beamer}
\date[]{\today}
\author[]{Romain NOËL}
\institute{Center for modern beamer themes}
% \titlegraphic{\hfill\includegraphics[height=1.5cm]{logo.pdf}}


\begin{document}

\maketitle

   \begin{frame}[toc]{Table of contents}%
      \tableofcontents%[hideallsubsections]
   \end{frame}

   
%%%%%%%%%%%%%%%%%%%%
%%%  MAINMATTER  %%%
%%%%%%%%%%%%%%%%%%%%
\input{section-Beamer.tex}

\input{section-Gotham.tex}

\input{section-Conclusion.tex}


\appendix

   \begin{frame}[fragile]{Backup slides}
      Sometimes, it is useful to add slides at the end of your presentation to refer to during audience questions.

      The best way to do this is to include \verb|\usepackage{appendixnumberbeamer}| in your preamble and call \verb|\appendix| before your backup slides.

      \themename{} will automatically turn off slide numbering and progress bars for slides in the appendix.
   \end{frame}


\end{document}