Create Renovate config file

[stephenwade]

What I did

Created a config file for Renovate, which we can use to automatically update our dependencies.

Alternative to #801, closes #780.

[changeset-bot]

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Latest commit: 1ceddf0

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[LarsDenBakker]

@daKmoR this seems like a good approach to me, what do you think?

[stephenwade]

FYI to copy from #780, here's the workflow I imagine for this config:

• Renovate is configured to automatically merge any minor version bumps (as long as tests pass). These wouldn't have changeset entries, so they wouldn't trigger a release, but any changes would be included in the next release.
• Renovate will not automatically merge major dependency updates. This will allow us to add a changeset entry before merging if we want the update to trigger a version bump.

[daKmoR]

thank you 🤗

let's try this out 💪