[Frontend] Standardize code style using prettier

[kwasi]

A kubeflow/metadata version of kubeflow/pipelines issue #2406.

As mentioned in that issue, Prettier will save formatting cycles in code review. It can also be setup with a file watcher to auto-format changed lines or files on save.

Sub-tasks

• Create a Prettier config
• Allow a week for comments on the config
• Format the whole code base after syncing with people with PRs in flight
• Add a section on code style to frontend/README.md

The last sub-task is blocked by updating the README.md file (#140).

[Bobgy]

Thanks for putting these together!

For sync with kubeflow/pipelines. I recommend we use the same config as https://github.com/kubeflow/pipelines/blob/master/frontend/.prettierrc.yaml

trailingComma: all
singleQuote: true
jsxSingleQuote: true
printWidth: 100

Let me know if there's anything you want to change. We can discuss and adjust the config back to kubeflow/pipelines too.

[kwasi]

Sounds good! We definitely want to keep all the frontend projects in sync so we'll start with your .prettierrc.yaml.

[jtfogarty]

/area front-end
/kind feature
/priority p2