Adding Vale to shared components for testing

[atsansone]

Replaces dart-lang/site-www#4231

[parlough]

Two concerns that will make this easier to review once addressed:

1. I'd prefer we not use the top-level /styles directory, as it can easily be mistaken for site styles. Consider something like /tool/vale/styles. https://vale.sh/docs/topics/config/#stylespath seems to have docs on configuring it. The ini file is fine in the root directory though.

2. I don't think we should check in the styles from third-party packages. It increases the size of the repo, has licensing concerns, and it's harder to tell what styles are custom or from packages. Consider adding a .gitignore file within the new /styles directory location that ignores all directories containing files not maintained by us.

Let me know if you have any concerns or issues with these changes though. Thanks!

[atsansone]

@parlough : Agreed on moving directories. Makes sense.

As for removing all styles not maintained by us, that would leave us with nothing. I want to merge this to be able to validate all of the Google styles as correct. They look to be correct with supporting links, but I want to be sure.

[parlough]

Thanks for moving the directory! You'll also need to change that setting in the .vale.ini file: https://vale.sh/docs/topics/config/#stylespath

As for removing all styles not maintained by us, that would leave us with nothing.

If we keep them in the repo though, we would need to make sure we account for each package's license. According to Packages and VCS on the Vale docs, it seems intended to not upload them and include them in the gitignore. It seems then each user that wants to use the Vale setup, will run vale sync locally, or rely on their editor's extension for doing so.

[atsansone]

@parlough : Good guidance! I'll make those changes today.

[atsansone]

@parlough : PTAL

[parlough]

Thanks for making those adjustments!

I haven't tried this out yet, but I think this should be good to land for us to start trying out. Thanks for exploring here :)