Stop documenting syntax 1.0 in Main.XWikiSyntax page

An Idea I had is that it would be nice to simplify Main.XWikiSyntax page and remove the documentation of Syntax 1.0 which is quite deprecated at this point. There is good reason to keep some documentation of how to use it somewhere but putting it in the main documentation page feels like it is somehow "promoting" syntax/1.0 so at the least, it is adding more information than most users need and at worst, possibly even leading people to continue using the old syntax.