feat(analytics): track API usage with Google Analytics

[gregswindle]

Feature request

1. User story summary

⌦ Describe what you want to accomplish {do something},
⌦ in what role/capacity {role},
⌦ and why it's important to you {achieve value}.

As a maintainer,
I want to know how the community uses govinfo-link-js
In order to repair defects and improve quality.

2. Acceptance criteria

⌦ Acceptance criteria define things that must be true when this feature is delivered.

Example: Job Applicants receive a confirmation email after they submit their resumes.

• 1. A democracy-ia account exists on Google Analytics (GA).
• 2. Custom dimensions for OS, Node Version, and App Version exist.
• 3. A valid GA tracking code exists.
• 4. govinfo-link-js uses yeoman/insight to track usage.
• 5. Valid reports appear on Google Analytics.
• 6. @democracy-ia/maintainers traffic are excluded from GA whenever people are acting in the role of Team Maintainer.