docs: sphinx: yocto-vars: rebuild files when poky.yaml has changed

poky.yaml changes aren't detected by Sphinx by default.

In order to detect changes in poky.yaml, its md5sum is stored in the
app.outdir (BUILDDIR/html when building html) and checked against the
md5sum of the poky.yaml under use.

If the md5sum has changed, find all rst files in app.srcdir that have at
least an occurence of `&.*;` and mark them as requiring a rebuild.

(From yocto-docs rev: 59537c7fa49e3ea6918f45b3201ad16d56988b9b)

Signed-off-by: Quentin Schulz <foss@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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