Fix dead links at crs_reference.md

[tuminoid]

| FILE: ./crs_reference.md
| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs
| 
| 3 links checked.
| 
| ERROR: 1 dead links found!
| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs → Status: 404

/triage accepted
/help
/good-first-issue

Split from #328

[metal3-io-bot]

@tuminoid:
This request has been marked as suitable for new contributors.

Please ensure the request meets the requirements listed here.

If this request no longer meets these requirements, the label can be removed
by commenting with the /remove-good-first-issue command.

In response to this:

| FILE: ./crs_reference.md
| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs
| 
| 3 links checked.
| 
| ERROR: 1 dead links found!
| [✖] https://github.com/metal3-io/metal3-dev-env/tree/master/crs → Status: 404

/triage accepted
/help
/good-first-issue

Split from #328

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[chibuikeIg]

Hi @tuminoid, can I be assigned this issue? I found a working link to the broken link
https://github.com/metal3-io/metal3-dev-env/tree/b5a53ecf9576c6deab81f692733782d4c5e8091a/crs

[tuminoid]

Sure!

/assign @chibuikeIg

[chibuikeIg]

Thank you! Will get it done shortly.

[metal3-io-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues will close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[Rozzii]

/remove-lifecycle stale