[Embeds] Create vite project and add to build pipeline (#3448)

* add bskyembed vite app

* create build script (temp until embedr is ready)

scripts/post-embed-build.js

@@ -0,0 +1,49 @@
+// const path = require('node:path')
+// const fs = require('node:fs')
+
+// const projectRoot = path.join(__dirname, '..')
+
+// // copy embed assets to web-build
+
+// const embedAssetSource = path.join(
+//   projectRoot,
+//   'bskyembed',
+//   'dist',
+//   'static',
+//   'embed',
+//   'assets',
+// )
+
+// const embedAssetDest = path.join(
+//   projectRoot,
+//   'web-build',
+//   'static',
+//   'embed',
+//   'assets',
+// )
+
+// fs.cpSync(embedAssetSource, embedAssetDest, {recursive: true})
+
+// // copy entrypoint(s) to web-build
+
+// // additional entrypoints will need more work, but this'll do for now
+// const embedHtmlSource = path.join(
+//   projectRoot,
+//   'bskyembed',
+//   'dist',
+//   'index.html',
+// )
+
+// const embedHtmlDest = path.join(
+//   projectRoot,
+//   'web-build',
+//   'static',
+//   'embed',
+//   'post.html',
+// )
+
+// fs.copyFileSync(embedHtmlSource, embedHtmlDest)
+
+// console.log(`Copied embed assets to web-build`)
+
+console.log('post-embed-build.js - waiting for embedr!')