Added separate Makefile for frontend

Makefile

@@ -1,10 +1,9 @@
+.PHONY: all backend frontend
+all: backend frontend
+
 backend:
 	npm install && \
 		npm run build
 
 frontend:
-	cd frontend && \
-		npm install && \
-		npm run build
-
-all: backend frontend
+	cd frontend && make

README.md

@@ -66,9 +66,3 @@ npm run dev
 cd frontend
 npm run dev
 ```
-
-### Lint with [ESLint](https://eslint.org/)
-
-```sh
-npm run lint
-```

frontend/Makefile

@@ -0,0 +1,5 @@
+.PHONY: all
+
+all:
+		npm install && \
+		npm run build

frontend/README.md

@@ -7,8 +7,7 @@ See [main `README`](../README.md) for more information.
 ## Building the frontend
 
 ```sh
-npm install
-npm run build
+make
 ```
 
 ## Configuration