Update CAEN Linux Remote Login Service URL

[hardy-ethan]

https://caen.engin.umich.edu/connect/linux-login-service/

[hardy-ethan]

Closes #201

[hardy-ethan]

I'm not sure if the host key warning needs to be included, or if the way it's included is good enough...

I don't think students have accessed the Linux Remote Login Service before taking 280, but I took 280 my first semester, so I wouldn't have had a chance to see it before 280.

I like having a mention of the warning so as not to cause concern (and to not accidentally ingrain "just say yes to ssh warnings").

[awdeorio]

Overall LGTM, I found one tiny spot that you might've missed:

$ ag -Q login.engin.umich.edu
docs/setup_caen.md
63:    ~/.ssh/known_hosts:1: login.engin.umich.edu

[hardy-ethan]

Overall LGTM, I found one tiny spot that you might've missed:

$ ag -Q login.engin.umich.edu

docs/setup_caen.md

63:    ~/.ssh/known_hosts:1: login.engin.umich.edu

That's intended, it's part of the warning students may get when using the new URL:

The host public key of the old and new CAEN URLs are the same. The first time someone who has used the old URL used the new one, they will get warned that the CAEN host key is already known as the old URL under the known_hosts file.

Reusing the host key is sometimes an issue, but in the case of this CAEN service, it's fine, so we want the students to accept the connection.

[awdeorio]

Whoops! That's my mistake for not checking the context when I did the text-search. LGTM

[awdeorio]

Because this involves a change to a live semester, I'll tag a current instructor to say whether it's OK to merge now or if we should wait. @jamesjuett @saquibrazak @sofiazxy

[hardy-ethan]

Whoops! That's my mistake for not checking the context when I did the text-search. LGTM

nw, it happens 👍 (it's also easier for me to see because I was the one that wrote it :P)

[jamesjuett]

LGTM. Thanks @hardy-ethan for making this contribution!

[jamesjuett]

I'm going to go ahead and merge, bypassing branch predictions - the Spec Preview is failing since this a fork and one of the necessary secrets isn't provided in that case.