Reorganising

[Ultraxime]

I moved the examples from being members of the workspace to being examples (so to use it we have to run cargo run --example <example>) which seems more cargo-esque.
I updated .vscode/launch.json to match these modifications and previous ones that were not considered.

I also renamed the module widgets to widget to match the organization of iced.

I corrected some errors in the documentation.

I added a pre-commit file, to ease the checking before pushing modification.

If you have any ideas for other things that could be done, I'll be happy to do them.
I plan on making another pull request later to improve the documentation and tests.

[genusistimelord]

This looks good, thank you.

If you wanted to go through all the issues and see which ones you might be able to solve, I'd be much appreciative of it.