website: Revert events with undefined dates
The website build fails because the added EuroBSDCon 2027 and
November 2027 FreeBSD Vendor Summit entries use placeholder dates
(""2027-09-xx"", ""2027-11-xx"") which cannot be parsed.
Revert these events for now. They should be re-added once the
exact dates are known.
website: Add 2027 events
Oh yeah, that's right, none of this "two weeks out" update,
we're adding the whole entire 2027, and it's still 2026 :)
Some of these do not have a finalized date and will need attention.
Reviewed by: bcr, hrs
Discussed with: adrian, cperciva
Differential Revision: https://reviews.freebsd.org/D61237
Status/2026Q3/doceng.adoc: Fix includes
Add some conditionals so that files to be included are found both from
www.freebsd.org/status/report-2026-07-2026-09/#_documentation_engineering_team
and
www.freebsd.org/status/report-2026-07-2026-09/doceng.