Use airtable request fields in place of hardcoded keys

[piratefsh]

Summary

We have a number of keys used to access Airtable objects that are hardcoded in the webapp. Example:

mutual-aid-app/src/webapp/components/RequestPopup.js

Line 62 in b02423c

{meta["First Name"]}

We should replace this hardcoded keys with the centralized list of Airtable keys here:

mutual-aid-app/src/lib/airtable/tables/requests.js

Line 234 in b02423c

const fields = (exports.fields = {

This should be importable from the webapp.

Bonus

Get ~airtable alias working within the webapp. I believe it's only possible to import via relative paths at the moment. This issue was faced here: https://github.com/crownheightsaid/mutual-aid-app/pull/104/files#r459213347

Why

This is important to prevent inconsistencies as well as typos that may lead to bugs! This app is also used by other mutual aids and having these keys in a centralized place makes it easy for them to adapt this app for their airtable, much like with string translations.

[mjmaurer]

Re: the bonus :::

I think alias should work (minus the tilde) as of #105