Update tocatta talk, add talks shell.nix and .envrc

doc/talks/.envrc

@@ -0,0 +1 @@
+use_nix

doc/talks/2023-01-18-tocatta/talk.tex

@@ -266,6 +266,13 @@
 
 \end{frame}
 
+\begin{frame}
+	\frametitle{Garage's architecture}
+	\begin{center}
+		\includegraphics[width=.35\linewidth]{assets/garage.drawio.pdf}
+	\end{center}
+\end{frame}
+
 \begin{frame}
 	\frametitle{Two big problems}
 	\begin{enumerate}

doc/talks/shell.nix

@@ -0,0 +1,12 @@
+{ pkgs ? import <nixpkgs> { } }:
+let
+  latex = (pkgs.texlive.combine {
+    inherit (pkgs.texlive)
+    scheme-basic 
+    beamer amsmath mathtools breqn
+    environ 
+    multirow graphics import adjustbox tabu vwcol stmaryrd ulem ragged2e
+    dvisvgm dvipng wrapfig hyperref capt-of;
+  });
+in pkgs.mkShell { nativeBuildInputs = [ pkgs.gnumake latex ]; }
+