add schematron rule for alt text and group image rules #20
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https://lumapps.atlassian.net/browse/DOC-3586
An alt attribute is always required on image elements, the alt attribute can have an empty value:
https://www.w3.org/WAI/tutorials/images/decision-tree/
These changes
Can the person that checks this PR first close Oxygen, then go to Fork, open the doctools repo, switch to my branch (DOC-3586...), open oxygen, and test if a warning appear if there is an image element with no alt?