Github actions CI build workflow

[jtmst]

This PR starts our github actions CI workflow. Currently it will just verify that the app builds properly. This PR also includes an initial run of lint/format so that we can add a check for code formatting in the future.

Major Changes

• Add ci.yaml to workflow
• Initial yarn format and yarn lint ran
• Downgrade eslint to 8 for compatibility with current next version

QA Steps

• App should build and run with no changes
• github action build check will need to be checked on a subsequent PR after this is merged

Note, LoC and file change numbers are inflated due to the initial run of prettier and eslint

[jtmst]

Should .vscode and .yarn/cache be in gitignore? Otherwise LGTM

They are recommended to be committed with yarn >3.0