If the first link to be verified contains a rel=me link with a SSL
error, the VerifyAccountLinksWorker will fail and not try the following
links. This rescues the SSL error when fetching the link, avoiding this
issue.

Fix #9365

(e.g. URL shortener)

* Verify link ownership with rel="me"

* Add explanation about verification to UI

* Perform link verifications

* Add click-to-copy widget for verification HTML

* Redesign edit profile page

* Redesign forms

* Improve responsive design of settings pages

* Restore landing page sign-up form

* Fix typo

* Support <link> tags, add spec

* Fix links not being verified on first discovery and passive updates