Libreboot 20231021 release announcement

Signed-off-by: Leah Rowe <leah@libreboot.org>

site/news/MANIFEST

+libreboot20231021.md
 audit3.md
 audit2.md
 argon2.md

site/news/audit3.md

@@ -86,6 +86,8 @@ Overall changes (summary):
 Here's a more full list of changes, expanding on the above; some entries above
 are also repeated below but in more detail:
 
+* Single-tree projects are no longer needlessly re-downloaded when they already
+  have been downloaded.
 * Scrubbing of vendor files *now* handled by the inject script, rather than
   the release script. This enables more robust handling of configs pertaining
   to vendor files, that tell lbmk where the files are and how to insert them; it

site/news/safety.md

@@ -5,6 +5,10 @@
 Introduction
 ============
 
+**UPDATE (21 August 2023): None of the proposals below have yet been
+implemented, and this page is still relevant for Libreboot 20231021. It applies
+to any system that requires vendor code to be inserted inside ROM images.**
+
 **UPDATE (16 August 2023): This also applies to the recently added Dell
 Precision T1650 mainboard.**