Support multiple doc id references and add support for NPM packages

Add an UIXP to be able to customize how the main documentation content is displayed

Provide a Version Macro

Provide a Deprecated Macro

Add a Documentation class for rendering macros + add a UIX

Add a Documentation class for UIXP + add a UIX

Rename the "org.xwiki.contrib.documentation.sheet" UIXP to "org.xwiki.contrib.documentation.sheet.top"