New web component: <webcare-webshare>

Uses the Web Share API to share a web site, falling back (on desktop usually) to a copy to clipboard workflow.

📮 Blog post: https://www.zachleat.com/web/webcare-webshare/
🖼️ Demo: https://zachleat.github.io/webcare-webshare/demo.html
⚙️ Source code: https://github.com/zachleat/webcare-webshare