feat: Add preview and edit mode for Breadboard Web

Author: Mearman

content/projects/Breadboard/Phase 2/Board for Each.md

@@ -21,3 +21,13 @@ A board that passes each object in an array through a board and returns the modi
 - [TypeScript](https://github.com/ExaDev/breadboard/blob/hackernews-simplified/packages/breadboard-web/src/boards/board-for-each.ts)
 - [JSON](https://github.com/ExaDev/breadboard/blob/hackernews-simplified/packages/breadboard-web/public/graphs/board-for-each.json)
 - [Open in Breadboard Web](https://breadboard-ai.web.app/?board=https://raw.githubusercontent.com/ExaDev/breadboard/hackernews-simplified/packages/breadboard-web/public/graphs/board-for-each.json)
+
+## Breadboard Web
+
+### Preview Mode
+
+<iframe src="https://breadboard-ai.web.app/?board=https://raw.githubusercontent.com/ExaDev/breadboard/business-review-reply/packages/breadboard-web/public/graphs/board-for-each.json&embed" style="width: 100%; height: 500px; border: 0;"></iframe>
+
+### Edit Mode
+
+<iframe src="https://breadboard-ai.web.app/?board=https://raw.githubusercontent.com/ExaDev/breadboard/business-review-reply/packages/breadboard-web/public/graphs/board-for-each.json" style="width: 100%; height: 500px; border: 0;"></iframe>