Further consolidate the libraries

api/handler/file/file.go

@@ -0,0 +1,16 @@
+// Package file serves file relative to the current directory
+package file
+
+import (
+	"net/http"
+)
+
+type Handler struct{}
+
+func (h *Handler) Serve(w http.ResponseWriter, r *http.Request) {
+	http.ServeFile(w, r, "."+r.URL.Path)
+}
+
+func (h *Handler) String() string {
+	return "file"
+}