Remove technique H59

[patrickhlauke]

the technique is out of date and has no real-world usefulness, since no major browser these days has any kind of <link rel="..."> navigation toolbar.

Closes #1234

Also x-ref #1077

[patrickhlauke]

wasn't sure if we outright delete/expunge techniques, or add some kind of "this is now obsolete" warning and keep it in perpetuity...happy to modify this PR accordingly if I was too brutal ripping it out

[patrickhlauke]

@alastc @mbgower any chance this could be looked at? it's fairly non-controversial in my view, because...no browser has any meaningful support for these <link rel="..." ...> constructs these days (and even back in the old days, only Opera really did something with them, for other browsers you needed extensions)

[ljoakley]

Refers to the use of the rel attribute using next/previous in a link tag. Google removed support for next/previous/ in 2019. 77% of all web traffic as of November 2023 uses google, advise removing it as the two attributes are now obsolete.

[bruce-usab]

On deck for call 1/26, no objections to deleting so far...