Remove any prior installation

src/freedombone-app-mailpile

     fi
 
     cd /var/www/$MAILPILE_DOMAIN_NAME
+    if [ -d /var/www/$MAILPILE_DOMAIN_NAME/htdocs ]; then
+        rm -rf /var/www/$MAILPILE_DOMAIN_NAME/htdocs
+    fi
     git_clone $MAILPILE_REPO htdocs
     cd htdocs
     git checkout $MAILPILE_COMMIT -b $MAILPILE_COMMIT