Convert project to TypeScript; add workflow to build with Vite then publish to GH Pages.

tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "isolatedModules": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "outDir": "./dist",
+    "rootDir": "./web/src",
+    "sourceMap": true
+  },
+  "include": ["web/src"]
+}