Enable using HSES staging data in dev

[rahearn]

Description of change

• Add a single environment variable CT_USE_REAL_API_DATA to turn on real API access in development
• Add dotenv gem to read configuration from .env file
• Add default values to .env
• Gem and NPM updates

Acceptance Criteria

Given the app is running locally with CT_USE_REAL_API_DATA=true When I visit the complaints list Then I see complaints from HSES's staging environment

How to test

1. Pull down code
2. Either set CT_USE_REAL_API_DATA to true in .env or create a new .env.local file with the content: CT_USE_REAL_API_DATA=true
3. Run rails server
4. Visit http://localhost:3000/complaints and verify HSES staging data is listed.

Issue(s)

• closes #146

Checklist

To be completed by the submitter:

• [x] Meets issue criteria
• [x] Code is meaningfully tested
• [x] Meets accessibility standards (WCAG 2.1 Levels A, AA)
• [x] API Documentation updated
• [x] Boundary diagram updated
• [x] Logical Data Model updated
• [x] Architectural Decision Records written for major infrastructure decisions

To the Reviewer

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