rescue: Update for changes for nextboot

[imp]

Summary

The nextboot.sh script no longer exists, so doesn't need to be fixed. We
also need a link to nextboot (since it's now free). However,

Sponsored by: Netflix

[emaste]

Something's missing from the commit msg; it ends with "However,"

Also commit message should have a fixes tag

[imp]

In D43843#1000169, @emaste wrote:

Something's missing from the commit msg; it ends with "However,"

Yea. Got interrupted.

Also commit message should have a fixes tag

So this bug is 4 years old, and is in all supported branches. I'm worried it would be viewed as a passive aggressive dig at the original work, which I've had mixed feeling about since I've had to go in and fix a number of things with it that weren't caught sooner.

Also, this doesn't actually fix a bug :)

[emaste]

Oh, the "fixes" I was thinking of is the commit that stops installing nextboot.sh.
My comment instead should be "this should be combined with D43831"

[imp]

In D43843#1000202, @emaste wrote:

Oh, the "fixes" I was thinking of is the commit that stops installing nextboot.sh.
My comment instead should be "this should be combined with D43831"

I'll just move it before that before D43831. I'd rather have the removal be as stand-alone as possible. rescue doesn't at all depend on what we install, so making this change can happen even if we were still installing nextboot.sh

[imp]

So I'm folding this and D43831 before pushing.

[imp]

merge reviews... note: I've updated commit message locally, but not in phab.