Bread types + Flat bread recipe (#15)

This adds the different bread types section including the flat bread recipe.

The flat bread is the most simple and easiest type of bread you can
make.

book/sourdough-starter/sourdough-starter-types.tex

@@ -173,6 +173,12 @@ starter jar was clearly inflated the most. On place 2 the regular starter
 followed. On place three the liquid starter followed with way less CO2
 production.
 
+\begin{figure}[!htb]
+  \includegraphics[width=\textwidth]{stollen}
+  \caption{A German christmas stollen made with a stiff starter instead of yeast}
+  \label{fig:stollen}
+\end{figure}
+
 I then proceeded and bought a cheap low cake flour in my nearby supermarket.
 This flour before had caused me massive headache before. I made a sourdough bread
 exactly how I would normally do. I had to reduce the hydration a bit as a low

book/sourdough-starter/sourdough-starter.tex

@@ -10,6 +10,7 @@ also learn how to store your starter for
 long-term storage.
 
 \section{Baker's math}
+\label{section:bakers-math}
 
 In a large bakery a determining factor is how
 much flour you have at hand. Based on the amount