use reports_order field instead of hardcoded value

[owades]

Description

Utilize new "reports_order" field rather than hardcoded "importance" value.

Resolves #259

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation

How has this been tested?

Manually reviewed JSON output and checked local reports site (see screenshot). Confirmed that order matches the previous hardcoded order.

Screenshots (optional)

[github-actions[bot]]

Preview url: https://PR-263--cal-itp-reports.netlify.app

[owades]

@charlie-costanzo, gah, I hate making you give me the same feedback twice. This is updated now, and I confirmed that the validation is passing

[charlie-costanzo]

@charlie-costanzo, gah, I hate making you give me the same feedback twice. This is updated now, and I confirmed that the validation is passing

@owades no worries at all, thank you for taking care of that!