Docs/releases: Add 4.19 relnotes template and update index

The 4.19 release is planned for January 2023.  Please add any updates to
the coreboot code that are should go into the notes between now and
then.  This helps in that you get to phrase the update the way you want,
and it lessens the load for the release managers.

Signed-off-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Change-Id: Ib5a7ddfc6cb1a8e0a485c1e1810631c86f4083c3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68459
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

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