[ENHANCEMENT] Add metadata to improve the appearance of links shared on social media

When a link to webstatus.dev is shared on social media, there isn't very much information that gets shown. Here's an example of drafting a post to Bluesky that includes a link to the [`page-setup`](https://webstatus.dev/features/page-setup) feature:

For links to specific features like this, it'd be great if the title and description included information about the feature itself. The image could also be dynamically generated to include the name of the feature as well as its Baseline status and browser support info.

Here's a poorly designed mockup of how that might look:

Other pages on the site could also benefit from more social-friendly metadata, but they wouldn't need to be dynamically generated.