fix headline hierarchy

thesis/content/05-proof-of-concept/technology-decisions.tex

@@ -32,7 +32,7 @@ GUN is a graph database that keeps a state in sync across multiple instances. GU
 
 \textit{todo...}
 
-\subsection{Using an Existing P2P Network}
+\subsubsection{Using an Existing P2P Network}
 \label{sec:using-existing-p2p-network}
 As mentioned in the previous section, setting up your own P2P network involves a number of challenges. If you use an already existing P2P network for your own purpose, these challenges can be elegantly avoided. For this purpose, however, a suitable P2P network must be found whose properties and possible uses meet the requirements of the hybrid OSN client.