Move "Add New Page" UI into hamburger menu
It's not typical to allow creating a new item in a list from a fake "add new" item in that list. This surfaces the functionality very clearly, but is vulnerable to mis-clicks, may prioritize an uncommonly-used feature, and isn't consistent with how content is typically added.
Instead, stick this in the hamburger menu, in the section that has other page-related actions
BUG: 494649 FIXED-IN: 6.3.0
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