remove obsolete file

git-purge-branches.txt

@@ -1,11 +0,0 @@
-Branch add-notes entfernt (war 72a320a).
-Branch better-error-messages entfernt (war d122220).
-Branch compare-pretty-html entfernt (war 584d229).
-Branch django3.1 entfernt (war c7bd15e).
-Branch enhance-html-snapshot entfernt (war 5c1fbe6).
-Branch issues56 entfernt (war a2c0d6c).
-Branch less-requests entfernt (war 5556158).
-Branch optimize entfernt (war fba1425).
-Branch optional-grouping entfernt (war 10d3149).
-Branch update-req entfernt (war 651d4be).
-Branch updates entfernt (war f6f1181).