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

Makefile

@@ -2,7 +2,8 @@
 lint:
 	cargo fmt -- --check
 	cargo clippy --all-targets --all-features -- -W clippy::unwrap_used -W clippy::expect_used -W clippy::panic -D warnings
-	cd webapp && npm install && npm run check
+	cd webapp/IronCalc/ && npm install && npm run check
+	cd webapp/app.ironcalc.com/frontend/ && npm install && npm run check
 
 .PHONY: format
 format:
@@ -15,7 +16,7 @@ tests: lint
 	# Regretabbly we need to build the wasm twice, once for the nodejs tests
 	# and a second one for the vitest.
 	cd bindings/wasm/ && wasm-pack build --target nodejs && node tests/test.mjs && make
-	cd webapp && npm run test
+	cd webapp/IronCalc/ && npm run test
 	cd bindings/python && ./run_tests.sh && ./run_examples.sh
 
 .PHONY: remove-artifacts