Install privacy-preserving analytics

[devmoran]

Action needed

• Sign-up for and install goatcounter to this repo.
• Free for use in non-commercial projects

Insert tracker here https://github.com/ossf/scorecard-webapp/blob/f6b02f59caa061f90dc9f4d6839bd87eb0a62e66/scorecards-site/nuxt.config.js#L47-L53

(This analytics engine is being used on slsa.dev to comply with various international data privacy requirements)