feat: implement build system and development workflow

- Add npm scripts for CSS/JS compilation (build:css, build:js, build)
- Create PowerShell build automation script
- Document development workflow in README
- Add troubleshooting guide for build issues
- Specify proper file structure and compilation process

Supports Tailwind CSS v3.4.0 and esbuild bundling with source maps.

node_modules/tailwindcss/src/lib/collapseAdjacentRules.js

@@ -0,0 +1,58 @@
+let comparisonMap = {
+  atrule: ['name', 'params'],
+  rule: ['selector'],
+}
+let types = new Set(Object.keys(comparisonMap))
+
+export default function collapseAdjacentRules() {
+  function collapseRulesIn(root) {
+    let currentRule = null
+    root.each((node) => {
+      if (!types.has(node.type)) {
+        currentRule = null
+        return
+      }
+
+      if (currentRule === null) {
+        currentRule = node
+        return
+      }
+
+      let properties = comparisonMap[node.type]
+
+      if (node.type === 'atrule' && node.name === 'font-face') {
+        currentRule = node
+      } else if (
+        properties.every(
+          (property) =>
+            (node[property] ?? '').replace(/\s+/g, ' ') ===
+            (currentRule[property] ?? '').replace(/\s+/g, ' ')
+        )
+      ) {
+        // An AtRule may not have children (for example if we encounter duplicate @import url(…) rules)
+        if (node.nodes) {
+          currentRule.append(node.nodes)
+        }
+
+        node.remove()
+      } else {
+        currentRule = node
+      }
+    })
+
+    // After we've collapsed adjacent rules & at-rules, we need to collapse
+    // adjacent rules & at-rules that are children of at-rules.
+    // We do not care about nesting rules because Tailwind CSS
+    // explicitly does not handle rule nesting on its own as
+    // the user is expected to use a nesting plugin
+    root.each((node) => {
+      if (node.type === 'atrule') {
+        collapseRulesIn(node)
+      }
+    })
+  }
+
+  return (root) => {
+    collapseRulesIn(root)
+  }
+}