Document changes and release 5.13.14pureos1 of linux-librem5

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
2 jobs for release51314_1 in 75 minutes and 17 seconds (queued for 1 second)
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librem5
build:aarch64

00:26:18

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librem5:arm64
build:deb

01:08:46