upgrade to new pretix, remove download, add page links

.install-hooks.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+REPO_DIR=$(git rev-parse --show-toplevel)
+GIT_DIR=$REPO_DIR/.git
+VENV_ACTIVATE=$VIRTUAL_ENV/bin/activate
+if [[ ! -f $VENV_ACTIVATE ]]
+then
+    echo "Could not find your virtual environment"
+fi
+
+echo "#!/bin/sh" >> $GIT_DIR/hooks/pre-commit
+echo "set -e" >> $GIT_DIR/hooks/pre-commit
+echo "source $VENV_ACTIVATE" >> $GIT_DIR/hooks/pre-commit
+echo "black --check ." >> $GIT_DIR/hooks/pre-commit
+echo "isort -c ." >> $GIT_DIR/hooks/pre-commit
+echo "flake8 ." >> $GIT_DIR/hooks/pre-commit
+chmod +x $GIT_DIR/hooks/pre-commit