`mintable.js` Refactor

[kevinschaich]

Fixes/changes:

• [x] Fixed account setup progress for Plaid
• [x] Switch from moment to date-fns
• [x] Refactor out certain configuration documentation to a provider-specific section
• [x] Add configurable template sheet for Google Sheets
• [x] Batchify update/clear/format requests for Google Sheets
• [x] Configurable start and end dates for Plaid
• [x] Handle pagination for Plaid
• [x] API for transaction providers
• [x] API for spreadsheet providers
• [x] Logging Improvements
• [x] Documentation improvements

Closes #11, #12, #16, #17