Minor fixes for TOC

diary.go

@@ -483,17 +483,14 @@ func renderDiaryMonth(fsPath, urlPath string) template.HTML {
 	for _, dayNum := range days {
 		date := time.Date(year, time.Month(monthNum), dayNum, 0, 0, 0, 0, time.UTC)
 
-		heading := formatGermanDate(date)
+		heading := date.Format("2006-01-02")
 		dayURL := path.Join(urlPath, fmt.Sprintf("%02d", dayNum)) + "/"
 		var content template.HTML
 		if dirName, ok := dayDirs[dayNum]; ok {
 			dayURL = path.Join(urlPath, dirName) + "/"
 			dayFsPath := filepath.Join(fsPath, dirName)
 			if raw, err := os.ReadFile(filepath.Join(dayFsPath, "index.md")); err == nil && len(raw) > 0 {
-				if h := extractFirstHeading(raw); h != "" {
-					heading = h
-					raw = stripFirstHeading(raw)
-				}
+				raw = stripFirstHeading(raw)
 				content = renderMarkdown(raw)
 			}
 		}