Move Glitch shortcode from both d.d.c and webdev into webdev-infra

The Glitch shortcode use the same code structure and style for both d.d.c and web.dev.
- https://web.dev/handbook/web-dev-components/#glitches
- https://developer.chrome.com/docs/handbook/components/#glitches

This shortcode can be moved into webdev-infra so it will be a shared shortcode which can be used by both d.c.c and web.dev.