Closing this issue because the brainstorming on the forum confirmed that this was unnecessary to have a direct reference to the Accessibility statement in xwiki standard.
I added a link to the Accessibility Statement in the footer of xwiki.org https://www.xwiki.org/xwiki/bin/view/XWikiOrgCode/Footer?viewer=changes&rev1=42.1&rev2=43.1&
