Drop the Gluon version reference from the site configuration used for
the CI builds.

These version indicators were most likely just copied from the example
site in the docs, where the version information makes sense. However,
the CI site is always built for a specific Gluon version and therefor
commit.

This avoids editing the version for each release.

Signed-off-by: David Bauer <mail@david-bauer.net>

Signed-off-by: David Bauer <mail@david-bauer.net>

Include the file-extension with the image-customization.lua file. This
will ease work with editors providing syntax highlighting, as they now
properly detect the file-type.

Signed-off-by: David Bauer <mail@david-bauer.net>

Now we use the new Image-customization framework in Gluon, we need to
also update the docs so examples and descriptions are acurate again.

Signed-off-by: David Bauer <mail@david-bauer.net>

(cherry picked from commit b313a631)

This updates the site.conf based on docs/site-example/site.conf for v2022.1

Do not fail the new check that good_signatures ≤ #pubkeys.