markdown-check: Check that binary links use the text "Open"

Binary links will only be allowed in these contexts, which is all that
we currently use them for anyways. This mainly gets rid of useless "not
checking local link" spam relating to binaries, and only a few local
links remain.

Userland/Utilities/markdown-check.cpp

@@ -213,9 +213,17 @@ RecursionDecision MarkdownLinkage::visit(Markdown::Text::LinkNode const& link_no
  if (url.path().starts_with("/res/icons/"sv)) {
  auto file = DeprecatedString::formatted("{}/Base{}", m_serenity_source_directory, url.path());
  m_file_links.append({ file, DeprecatedString(), StringCollector::from(*link_node.text) });
- return RecursionDecision::Recurse;
+ } else if (url.path().starts_with("/bin"sv)) {
+ StringBuilder builder;
+ link_node.text->render_to_html(builder);
+ auto link_text = builder.string_view();
+ if (link_text != "Open"sv) {
+ warnln("Binary link named '{}' is not allowed, binary links must be called 'Open'. Linked binary: {}", link_text, href);
+ m_has_invalid_link = true;
+ }
+ } else {
+ outln("Not checking local link {}", href);
  }
- outln("Not checking local link {}", href);
  return RecursionDecision::Recurse;
  }
  }