Merge remote-tracking branch 'remotes/marcandre/tags/rtd-pull-request' into staging

Pull request

# gpg: Signature made Fri 14 May 2021 12:12:24 BST
# gpg:                using RSA key 87A9BD933F87C606D276F62DDAE8E10975969CE5
# gpg:                issuer "marcandre.lureau@redhat.com"
# gpg: Good signature from "Marc-André Lureau <marcandre.lureau@redhat.com>" [full]
# gpg:                 aka "Marc-André Lureau <marcandre.lureau@gmail.com>" [full]
# Primary key fingerprint: 87A9 BD93 3F87 C606 D276  F62D DAE8 E109 7596 9CE5

* remotes/marcandre/tags/rtd-pull-request:
  sphinx: adopt kernel readthedoc theme

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>