Editorial: Delete gitattributes, gitignore, pr-preview, readme, and other unwanted files for this monorepo

[daniel-montalvo]

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[spectranaut]

Actually, I think we left most of these files on purpose. The various specs might want to keep their READMEs, maybe we should update them to be more useful. And I assume the editors had the git-ignores for a reason, and these can be file specific. The pr-previews should go though, and probably the .gitattributes -- I'm curious what other editors think though.

[pkra]

My initial reaction was "let's keep the readme's" - but I really don't have strong feelings about this.

[spectranaut]

How about keeping the READMEs, @daniel-montalvo, and deleting everything else?

[daniel-montalvo]

Will update accordingly, @spectranaut

[daniel-montalvo]

I am closing this without merging. This is not causing any issues now, and could potentially cause problems for some editors according to Val's comment above

If there's updates needed for these files we could open new PRs for them as we need them.