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

* add bskyembed vite app

* create build script (temp until embedr is ready)

bskyembed/.eslintrc

@@ -0,0 +1,20 @@
+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint", "simple-import-sort"],
+  "extends": [
+    "eslint:recommended",
+    "preact",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended-requiring-type-checking"
+  ],
+  "rules": {
+    "simple-import-sort/imports": "warn",
+    "simple-import-sort/exports": "warn"
+  },
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": "latest",
+    "project": "./tsconfig.json"
+  }
+}