Remove SSL support

If there's a need for SSL, you can always use a reverse proxy or
a more advanced WSGI server.

This reverts commit 1678890d3d.

ankisyncd.conf

@@ -1,9 +1,6 @@
 [sync_app]
 host = 127.0.0.1
 port = 27701
-ssl = true
-certfile = /etc/ssl/certs/server.pem
-keyfile = /etc/ssl/private/privkey.pem
 data_root = ./collections
 base_url = /sync/
 base_media_url = /msync/