remove extra info from diff-file shown

pages/commit.go

@@ -14,6 +14,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"regexp"
 	"strings"
 )
 
@@ -55,6 +56,8 @@ func HandleCommit(c *fiber.Ctx) error {
 			"error": err,
 		})
 	}
+	re := regexp.MustCompile("\\A(?s).*?---(?-s).*\\n")
+	file = re.ReplaceAllString(file, "---\n")
 	lexer := lexers.Match("something.diff")
 	if lexer == nil {
 		lexer = lexers.Fallback