Versions: Lit-Element to 2.4.0 and Lit-HTML to 1.3.0

This fixes a typescript problem and allows us to enable type checking
in the typescript-example package (by removing the ts-nocheck comment)

lerna complains about this

And remove the custom publish commands

When selecting select2 shows the "loading.." state for a short time there
which shifts down the result list and makes the selection select the wrong
item.

Work around that by hiding the loading indicator after fetching the data is done
and allow it again once something is selected.