Treats markdown link text as URL

[dbr]

If I have a markdown where the link text is a broken link, but the actual link target is a valid URL,

$ cat test.md 
[https://dummyexample.gov/notexist (archive.org link)](https://web.archive.org/web/20241129184733/http://example.com)

I would expect it only checks the web.archive.org link, but it checks both the link-text and the URL

$ lychee -v test.md 
   [ERROR] https://dummyexample.gov/notexist
     [200] https://web.archive.org/web/20241129184733/http://example.com

Issues found in 1 input. Find details below.

[test.md]:
   [ERROR] https://dummyexample.gov/notexist

🔍 2 Total (in 2s) ✅ 1 OK 🚫 1 Error

This seems to relate to #949 (comment) except this is a slightly different case (as a markdown parser might helpfully convert http://example.com to <a href="example.com">http://example.com</a> - but it would surely be nonsensical to ever do the same for dummyexample.gov in the initial example - it would be a link inside a link)

[mre]

Yeah, we started treating plaintext links in HTML files as false-positives in #1528. Something similar could work for Markdown files.

@markogalevski fyi