Delete networks and templates using hsv2

This is to get these out of the way for continued refactoring.

v2 hidden services are now long-deprecated. Even the tor included in today's debian-oldstable (tor 0.4.5.16, debian bullseye) rejects a torrc that tries to configure one:

Nov 14 16:18:51.599 [notice] Tor 0.4.5.16 running on Linux with Libevent 2.1.12-stable, OpenSSL 1.1.1w, Zlib 1.2.11, Liblzma 5.2.5, Libzstd 1.4.8 and Glibc 2.31 as libc.
...
Nov 14 16:18:51.601 [warn] HiddenServiceVersion must be 3, not 2.
Nov 14 16:18:51.601 [warn] Failed to parse/validate config: Failed to configure rendezvous options. See logs for details.
Nov 14 16:18:51.601 [err] Reading config failed--see warnings above.