Remove or replace nginx plugins

Tutor 13 removed Nginx, so these plugins need to be either rewritten to work for Caddy, or removed:

• entry-caddy.yml should not be necessary anymore
• entry-deflect.yml we don't use it, can be removed
• filter-tracking-log.yml nginx part can be removed. Double-check if Caddy logs IP addresses!
• nginx-security.yml Double check if we need to add this stuff to the caddyfile
• totem-proxy.yml: Will be replaced by what's done for js-totp-problem#68 (closed)