cdnjs is a free distributed JS library delivery service.
Google Analytics is a free web analytics service that tracks and reports website traffic.
HighLevel is an all-in-one marketing and automation platform designed for marketing agencies and small businesses to manage CRM, marketing campaigns, sales funnels, appointment scheduling, and more.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Vercel is a cloud platform for static frontends and serverless functions.