switch from gulp to vite to build, add types for reveal.js config

vite.config.styles.ts

@@ -0,0 +1,20 @@
+import { resolve } from 'path'
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  root: './',
+  build: {
+    emptyOutDir: false,
+    cssCodeSplit: true,
+    lib: {
+      formats: ['es'],
+      entry: {
+        'reveal': resolve(__dirname, 'css/reveal.scss'),
+        'reset': resolve(__dirname, 'css/reset.css'),
+
+        'theme/black': resolve(__dirname, 'css/theme/black.scss'),
+      },
+    }
+  },
+  plugins: [],
+})