Change the version number in docs-preview.html

Update some more version number

Meaning that following the docs or tutorial won't work until the release is complete

Add sixtyfps-lsp in the publish script

Fix horizontal scrollbar in ugly style

the new rendering backend behavior is different if the border radius is bigger
than the small border

More fixes to disabled widgets

Fix the extension of the npm package

Add the todo demo do the main readme

Rename sixtyfps-rs-macro to sixtyfps-macros