chg: doc: CVE template suggestions

Suggested changes to the CVE checklist, submitted for your approval (or rejection).  Commits in order of decreasing priority:

* 81bd4025c0e4ac407d5a8c7e0c414e2ed20f543f: Update Zulip link for new bind-incidents channel
* 65caa4912b25058cdeaef35094985424f2b2478f: Explicit sub-steps for assessing -S and EOL
* 1dc0d656edc1f6b5586da3ec1d416e5223c5504a: Clearer separation between CVE and CVSS+CWE steps
* 5ebb9ac33fda59adec6b9019bd211e96edebca49: EVN texts: Clarify what is done, when, and using which tool
* 29a79c21cbfe3477cd706861eeb12b53c98e2091: Use reference links for Earliest Notification and printing-press, to make the table less cumbersome to edit
* fd1b6d98c3cef2f6d212a5988b3726d933c84d27: Add TOC and sections for better (?) navigation
* 803b1d2aff04cf88ab860b42e3463c57fbf17f6d: Remove a few words to make the table narrower
* e68a1c84bd41a769ea8d96b7542cd7c062dd4af1: Clearer links to instructions, at top (bikeshed-y)
* e75b65072fe6eb271667659eac79817da1dd6515: Typo fix to the above

Merge branch 'bscott-cve-quicklist-tweaks' into 'main'

See merge request isc-projects/bind9!12221