Fix markdown image with link (#4675)

* Fix markdown image with link

* Add gitea copyright notice

* add a test for markdown image with link

* remove svg related variables

modules/markup/markdown/markdown_test.go

@@ -73,6 +73,7 @@ func TestRender_Images(t *testing.T) {
 
 	url := "../../.images/src/02/train.jpg"
 	title := "Train"
+	href := "https://gitea.io"
 	result := util.URLJoin(AppSubURL, url)
 
 	test(
@@ -82,6 +83,9 @@ func TestRender_Images(t *testing.T) {
 	test(
 		"[["+title+"|"+url+"]]",
 		`<p><a href="`+result+`" rel="nofollow"><img src="`+result+`" title="`+title+`" alt="`+title+`"/></a></p>`)
+	test(
+		"[!["+title+"]("+url+")]("+href+")",
+		`<p><a href="`+href+`" rel="nofollow"><img src="`+result+`" alt="`+title+`"/></a></p>`)
 }
 
 func testAnswers(baseURLContent, baseURLImages string) []string {