add google map and backend routing

[raymondwusuper]

Tracking Info

Resolves #109

CSS Checklist

• Do you have width, padding, margin with a high (> ~ 100px) or negative value? Do you need it? Can rem em % vw vh be used instead?
• Did you avoid hard coding positions? (position, top, left, rules) Can display:flex; and justify and align uses be used instead?

Changes

• TODO

Testing

• TODO

Confirmation of Change

TODO

[Miyuki-L]

Just a few comments on using our fetch wrapper to call the backend and some other minor stuff. But also Address the linter