refactor: Remove provisionerd from Makefile (#184)

This fixes an error that would occur in running `make build` - there isn't a `cmd/provisionerd/main.go` available at the moment.

Makefile

@@ -3,12 +3,7 @@ bin/coderd:
 	go build -o bin/coderd cmd/coderd/main.go
 .PHONY: bin/coderd
 
-bin/provisionerd:
-	mkdir -p bin
-	go build -o bin/provisionerd cmd/provisionerd/main.go
-.PHONY: bin/provisionerd
-
-build: site/out bin/coderd bin/provisionerd
+build: site/out bin/coderd 
 .PHONY: build
 
 # Runs migrations to output a dump of the database.