linkchecker writes a lot of junk to stdout when launching:

./linkchecker https://example.com
INFO linkcheck.cmdline 2018-04-13 15:57:51,210 MainThread Checking intern URLs only; use --check-extern to check extern URLs.
LinkChecker 9.4.0              Copyright (C) 2000-2014 Bastian Kleineidam
LinkChecker comes with ABSOLUTELY NO WARRANTY!
This is free software, and you are welcome to 

In iterative/dvc#4686 user got confused, when push for repository with external cache had no effect and did not copy the data to the remote.

We already mention that we need an external cache for external outputs. We should probably include the information that this cache is taking care o

Introduction

The current check method of our client only accepts a URI, so users have to do this slightly awkward dance to get a link checked:

let url = Url::parse("https://github.com/lycheeverse/lychee")?;
let response = client.check(Website(url)).await;

We've been discussing whether we should support a simplified interface as well that simply accepts strings:

``