Delete widgets code

[osanseviero]

The code from widgets has been moved back to internal. Having it duplicated has led to confusion with the icons and widgets, so this PR proposes to delete all of it

[julien-c]

i think @coyotte508 left it on purpose (as a reference for anyone in the community who could play with it) but idk

[julien-c]

There is a big Note: this package is no longer maintained. it should be enough for our team members no?

[coyotte508]

we had someone make a contribution to the outdated widgets (a bug fix), it was helpful, we ported it internally

but yes, ok to remove 😢

[osanseviero]

Up to you if you really think it's good to keep up, but we should prevent issues such as people adding icons here and not in the internal code or adding widgets here (#732 or #870)

as a reference for anyone in the community who could play with it

For this I guess we should automatically update the external one, right?

[julien-c]

internal team members it's pretty easy to tell them no?

[osanseviero]

Sure but does save work. New one #953