Create new openedx-search repo

[ormsbee]

This is intended to be a long-term successor to edx-search.

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[ormsbee]

Created https://github.com/openedx/openedx-search

I'm currently fixing up a template to push to it.

FYI @blarghmatey, @bradenmacdonald

[ormsbee]

I've pushed a template to it. It's still in broken state as a repo, but it's at least unblocked enough to make a PR for the first ADR. I'll work on fixing it up properly today.