[dev] Using `$meta`, you can now ~hide the header bar, and change its color/background, and add tags to your generator

By "hide" I mean it shows a button in the top-right, which when clicked, shows the full header bar.

Examples:

• https://perchance.org/tags-and-header-meta-data-example

• https://perchance.org/header-background-image-example

Please let me know if you run into any issues or have feedback 🙏

Edit: Also, for people who know some JavaScript, you can use the public generator list API to get generators with specific tags like this:

let data = await fetch(`https://perchance.org/api/getGeneratorList?tags=foo`).then(r => r.json()); // returns generators tagged 'foo'
let data = await fetch(`https://perchance.org/api/getGeneratorList?tags=foo,bar`).then(r => r.json()); // foo AND bar