Fix module name to match major version v3. Simplify makefile. (#213)

Co-authored-by: Marco Piovanello <35533749+marcopeocchi@users.noreply.github.com>

Makefile

@@ -7,14 +7,12 @@ fe:
 	cd frontend && pnpm install && pnpm build
 
 dev:
-	cd frontend && pnpm dev
+	( cd frontend && pnpm install && pnpm dev )
 
-all:
-	$(MAKE) fe && cd ..
+all: fe
 	CGO_ENABLED=0 go build -o yt-dlp-webui main.go
 
-multiarch:
-	$(MAKE) fe
+multiarch: fe
 	mkdir -p build
 	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o build/yt-dlp-webui_linux-amd64 main.go
 	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o build/yt-dlp-webui_linux-arm64 main.go