using a non-tmp dir for thumbs

setup.go

@@ -3,7 +3,6 @@ package caddyhugo
 import (
 	"fmt"
 	"html/template"
-	"io/ioutil"
 	"os"
 	"path"
 
@@ -90,14 +89,9 @@ func (ch *CaddyHugo) Setup(dir string) error {
 		return fmt.Errorf("edit template invalid: %v", err)
 	}
 
-	thumbDir, err := ioutil.TempDir("", "thumbs")
-	if err != nil {
-		return fmt.Errorf("couldn't initialize media: %v", err)
-	}
-
 	ch.Media = &media.MediaSource{
 		StorageDir: path.Join(dir, "media"),
-		ThumbDir:   thumbDir,
+		ThumbDir:   path.Join(dir, "thumbs"),
 	}
 
 	err = os.MkdirAll(ch.Media.StorageDir, 0755)