When the address bar is hidden, sometimes the visual position of the controls is out of sync with its logical position.

Reduces duplication and makes maintenance easier.

Add `tabindex="-1"` and `aria-disabled="true"` to disabled link

We use the official HTML validator for HTML validation, and we don't really use any of the htmllint features.

Fixes #27595

* remove jobs link
* specify a link in the BrowserStack image

this is the opposite of `.text-nowrap`, and a forces elements to wrap onto new lines.

One use case for this is extra long button text. Bootstrap buttons by default do no wrap, so this class could be used to override that behavior.

This should be faster.

After 3256a2c2, blc honored robots.txt thus it didn't crawl anything.
Ignore robots.txt to work around the issue.