Fix HTML validator menu

The W3C validator is now protected under a CloudFlare JavaScript
challenge. However, it can be bypassed by opening directly the link
after the redirection. It doesn't work if an HTML 5 page is loaded, as
that would redirect to the Nu validator which will attempt to run the
challenge again.

So the current solution is to use the "legacy" W3C validator for HTML
4.01 or older documents and the W3C Nu validator for HTML 5 documents
only. Users would need to choose which one to use manually (at least for
now).

The WDG validator at https://www.htmlhelp.org/tools/validator/ is gone,
the server reports "Server unable to read htaccess file, denying access
to be safe", so it has been removed.

Fixes: https://github.com/dillo-browser/dillo/issues/113

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