Setup renovate

Need to determine what to include in the updates. Final list is the following as a starting point:

Node packages: depcheck, json_schema_secure, lint_lockfile, lint_md, lint_npm_package, node_sbom, npm_check, prepare_release, unicode_bidi_test
Container images: create_release, pa11y_ci, pagean

Edited Mar 07, 2022 by Aaron Goldenthal

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information