Cleanup Makefile, add Caddy

Makefile

@@ -1,4 +1,4 @@
-.PHONY: run test build frontend backend
+.PHONY: run run-backend run-frontend test
 
 run:
 	# See backend/config.py for more fields
@@ -6,15 +6,11 @@ run:
 	COOKIES_DIR=cookies \
 	python3 ./backend/main.py
 
+run-backend: run
+
+run-frontend:
+	@echo 'Only for development environment!'
+	caddy run
+
 test:
-	@python3 -m unittest discover -vcs ./backend
-
-build:
-	make frontend
-	make backend
-
-frontend:
-	@cd frontend && echo 'Not implemented'
-
-backend:
-	@cd backend && echo 'Not implemented'
+	python3 -m unittest discover -vcs ./backend