Announce 13.0-RC3

Sponsored by:	Rubicon Communications, LLC ("Netgate")

website/data/en/news/news.toml

@@ -1,6 +1,11 @@
 # Sort news by year, month and day
 # $FreeBSD$
 
+[[news]]
+date = "2021-03-20"
+title = "FreeBSD 13.0-RC3 Available"
+description = "The third RC build for the FreeBSD 13.0 release cycle is now available. ISO images for the amd64, arm64, armv6, armv7, i386, powerpc, powerpc64, powerpcspe, powerpc64le, and riscv64 architectures are <a href=\"https://lists.freebsd.org/pipermail/freebsd-stable/2021-March/093340.html\">available</a> on most of our <a href=\"https://www.FreeBSD.org/doc/en/books/handbook/mirrors-ftp.html\">FreeBSD mirror sites</a>."
+
 [[news]]
 date = "2021-03-15"
 description = "New committer: <a href=\"mailto:khng@FreeBSD.org\">Ka Ho Ng</a> (src)"