Switch node to js frontmatter, update devDeps

[rdela]

Update devDeps eleventy 3.0.0-alpha.17, eleventy-img 4.0.2, linkedom 0.18.4

@11ty/eleventy 3.0.0-alpha.1 - 3.0.0-beta.1

https://github.com/11ty/eleventy/compare/v3.0.0-alpha.1...v3.0.0-beta.1

@11ty/eleventy-img ^3.1.8 - ^4.0.2

https://github.com/11ty/eleventy-img/compare/v3.1.8...v4.0.2

linkedom ^0.14.25 - ^0.18.4

https://github.com/WebReflection/linkedom/compare/v0.14.25...v0.18.4

Side note, this is a precursor PR to my beginning to tinker around here 🛟✨🍩

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[rdela]

switch node to js frontmatter https://github.com/11ty/eleventy/issues/2819#issuecomment-2256949912