chore(deps): remove eleventy package from dependencies

[102]

eleventy (as opposed to @11ty-scoped packages) is not used as a dependency for this project

[KenEucker]

eleventy is used for hosting examples. Look at the serve script.

[102]

eleventy is used for hosting examples. Look at the serve script.

I have updated scripts to also explicitly use @11ty/eleventy, as mentioned in the docs:

WARNING:
Make sure you always use npx @11ty/eleventy (including the @11ty/ prefix!). If you do not include the @11ty/ prefix and you don’t already have Eleventy installed (locally or globally), it will execute the wrong package. For consistency and accuracy always use npx @11ty/eleventy.

eleventy is a bin which is also provided by @11ty/eleventy, not by eleventy