update readme

.ci/build_document.sh

@@ -9,5 +9,5 @@ if ! command -v tree &> /dev/null
 then
   echo "No tree utility found, skipping making tree"
 else
-  tree -H '.' -I "index.html" -D --charset utf-8 -T "" > index.html
+  tree -H '.' -I "index.html" -D --charset utf-8 -T "Heiratssatz" > index.html
 fi

README.md

@@ -1,6 +1,6 @@
-#  
+# Heiratssatz
 
-These are the lecture notes for the '', taught in  at the University of Bonn.
+Notizen für einen einstündigen Mathezirkel zum Heiratssatz, gehalten auf dem Mathecamp 2020 in Violau.
 
 The [latest version][1] is availabe as a pdf download via GitLab runner.
 You can also have a look at the generated [log files][2] or visit the