Add webUI into binary

To get the most simple deployment of excalidraw, the binary should ship
all components (webUI, socket.io, data storage).

README.md

@@ -1,12 +1,17 @@
-# Exalidraw Backend
+# Exalidraw Complete
 
 Frustrated on how difficult it is to setup excalidraw self-hosted but with data
 storage and collaboration function this represents and attempt to run the
-necessary function with a single binary implemented in go.
+necessary function with a single binary implemented in go. This includes:
 
-Apply the patch to the frontend and build excalidraw. Run Excalidraw frontend and
-on the same host run
+- the frontend UI
+- a in-memory data layer
+- socket.io implementation for collaboration
+
+Apply the patch to the frontend and build excalidraw into `frontend`. Run
 ```bash
 go run main.go
 ```
 
+Everything will be served under `localhost:3002`
+