Move to a Node package for TailwindCSS

To better use Tailwind CSS in this project, I've moved the project to
being a node package.

.gitignore

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+package-lock.json
+node_modules/
+
+static/css/*.css

package.json

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+{
+  "name": "js-starfish",
+  "version": "0.9.0",
+  "description": "",
+  "main": "index.html",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build-css": "npx postcss ./src/css/main.css -o ./static/css/styles.css"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git@git.vzqk50.com:ApisNecros/js-starfish.git"
+  },
+  "author": "Apis Necros",
+  "license": "MIT",
+  "devDependencies": {
+    "autoprefixer": "^10.4.14",
+    "postcss": "^8.4.22",
+    "postcss-cli": "^10.1.0",
+    "tailwindcss": "^3.3.1"
+  }
+}

postcss.config.js

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+module.exports = {
+    plugins: {
+        tailwindcss: {},
+        autoprefixer: {},
+    }
+}

src/css/main.css

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;

tailwind.config.js

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+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: ["./**/*.html"],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+}
+