[cleanup] Updated pages to the new xar format

(cherry picked from commit acd6d47636915daa6e77b5f358529f7cae8e6b8e)
XWIKI-6328: Wrong rendering of annotations on Blog
- Applied the workaround for the HTML macros issue that Annotations has by removing excessive and unjustified use of the HTML macro when rendering blog artices/posts.

(cherry picked from commit 17ac86a205d7a5db56c1d3de39e887f252dbefe7)