es-module-shims should probably be removed (from the startup pattern)

[chase-moskal]

we used to always rely on es-module-shims to power dev mode

but now, all the browsers except ie11 supports import maps,

so i think we can stop using es-module-shims, since we can assume developers will use modern browsers.

💡 maybe it's smarter to relegate es-module-shims as an option, so we can enable it for the specific case of debugging in ie11..

[chase-moskal]

i think we should fully abandon IE11 an remove es-module-shims entirely.

if we need to debug something in IE11, we can manually add es-module-shims where it's needed for the specific purpose.

• we'll rework the startup scripts pattern to remove es-module-shims
• we'll remove es-module-shims from /s/scripts/turtle-install