removed poetry in favor of pip, using node 18

[derekeder]

Netlify reqiures Node 18 and building as it is currently set up fails. This PR updates the Dockerfile to use node 18 and removes poetry as a build dependency and moves everything over to pip.

Successful deploy to Netlify took a bit of trial and error with the build and site commands, but these settings look to be what we need:

• Build command: npm run build
• Publish directory: dist

Figuring out the dist folder was determined by the settings at the bottom of .eleventy.js:

return {
    dir: {
      input: "site/",
      output: "dist",
      includes: "_includes",
      layouts: "_layouts",
    },
    templateFormats: ["html", "md", "njk", "11ty.js"],
    htmlTemplateEngine: "njk",
    passthroughFileCopy: true,
  }

[netlify[bot]]

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