UPDATE: split the webapp in a widget and the app itself

This splits the webapp in:

* IronCalc (the widget to be published on npmjs)
* The frontend for our "service"
* Adds "dummy code" for the backend using sqlite

Cargo.toml

@@ -10,6 +10,7 @@ members = [
 
 exclude = [
   "generate_locale",
+  "webapp/app.ironcalc.com/server",
 ]
 
 [profile.release]