track: Usage with Google Analytics, Feedback with Google Form

[bbest]

Would be great to have these added to this manual:

• Usage: Google Analytics
  Free and easy to track web traffic with Google Analytics. Since ak-info uses an rmarkdown website, you can add a header a la here.

• Feedback: Google Form
  Easy to collect feedback by creating a Google Form. You can convert responses to a Google Sheet and get notified with any new submission. Then just add a Feedback button or link to it from the page.

[bbest]

Documented this fairly fully here:

• setup Google Analytics for cinms · Issue #77 · noaa-onms/cinms

Doing this now for OCNMS here:

• + Google Analytics · Issue #45 · noaa-onms/ocnms

[bbest]

• NOTE: should do this for /_site.yml on main Rmds + /modals/_site.yml so we track modal usage