No install caddy

[Whitestrake (Matthew Fay)]

Hi @Alex_Kim, have a look at this forum post regarding recent build server issues:

Caddy 1.0.0-beta2 released, and instructions for plugin developers

Some of you have noticed that building Caddy from source (or from the download page!) has been a little difficult lately. The good news is: building Caddy yourself from source is now much better! It no longer requires using a special build script. And adding plugins no longer requires modifying Caddy’s source code. We’ve updated the README and developer wiki to include the latest instructions. We’re transitioning to using Go modules, which is an official dependency management system built int…