Add Caddy plugins:

- [http.filter](https://caddyserver.com/docs/http.filter)
  for changing Wekan UI on the fly, for example custom logo,
  or changing to all different CSS file to have custom theme;
- [http.ipfilter](https://caddyserver.com/docs/http.ipfilter)
  to block requests by ip address;
- [http.realip](https://caddyserver.com/docs/http.realip)
  for showing real X-Forwarded-For IP to behind proxy.

Thanks to Caddy contributors and xet7 !

snapcraft.yaml

@@ -176,7 +176,7 @@ parts:
 
     caddy:
         plugin: dump
-        source: https://caddyserver.com/download/linux/amd64?license=personal
+        source: https://caddyserver.com/download/linux/amd64?plugins=http.filter,http.ipfilter,http.realip&license=personal&telemetry=off
         source-type: tar
         organize:
           caddy: bin/caddy