Move top-level crates to packages/<crate>

[philip-peterson]

Description

This moves all top-level crates to a directory called packages and updates relevant documentation.

Fixes #1669

Checklist

• I have run cargo make pr-flow
• I have reviewed my own code
• I have added tests

[github-actions]

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[philip-peterson]

Seeing a strange CI failure.

    Checking yewtil-macro v0.2.0 (/home/runner/work/yew/yew/packages/yewtil-macro)
error[E0432]: unresolved import `syn::export`
Error:  --> packages/yewtil-macro/src/function_component.rs:4:10
  |
4 | use syn::export::ToTokens;
  |          ^^^^^^ could not find `export` in `syn`

[ranile]

I think that the examples should be kept at root so any newcomer who doesn't know the directory structure doesn't assume that there aren't any examples without looking under the packages directory. I feel like it isn't right to expect newcomers to look in a subdirectory to find the examples directory.

[jstarry]

Thanks for taking this on @philip-peterson, happy to merge when CI is happy and examples get moved back to root like @hamza1311 has suggested

[jstarry]

Can you also rebase to pick up the fix in #1683?

[philip-peterson]

Rebased and adjusted, PR is now failing on some integration tests I'm not sure how to fix.

[jstarry]

Thanks for your thoroughness!

[philip-peterson]

@jstarry Happy to be of help!