Add a few more commands to make

Makefile

@@ -1,5 +1,17 @@
+clean:
+	rm -rf _cache
+	rm -rf public
+
+site:
+	cabal build --write-ghc-environment-files=always
+
 build:
 	cabal exec site build
 
 watch:
-	cabal exec site build && cabal exec site watch
+	cabal exec site watch
+
+all:
+	make clean
+	make site
+	make build