Create flutter project in frontend directory. Serve frontend web build in backend app.

Makefile

@@ -1,7 +1,16 @@
 VENV_DIR := .venv
 
-install: 
-	@if [ ! -d "$(VENV_DIR)" ]; then \
-		python3 -m venv $(VENV_DIR); \
-	fi
+default: install web
+
+venv: $(VENV_DIR)
+
+$(VENV_DIR):
+	python3 -m venv $@
+
+install: venv
 	@$(VENV_DIR)/bin/pip install -r backend/requirements.txt
+
+web: frontend/build/web/index.html
+
+frontend/build/web/index.html: 
+	cd frontend && flutter build web