add support for tags

test_template/main.typ

@@ -8,6 +8,7 @@
     alt: "A drawing of a blue-ish round-ish platypus with big eyes, holding a laptop. This platypus is quite cute, but I might be biased.",
   ),
   author: "Me!",
+  tags: ("test", "html/css", "typst"),
   description: "Test of the TTT template",
   date: datetime(year: 1942, month: 4, day: 1),
 )
@@ -171,6 +172,11 @@ thead {
     summary(
       url: "http://test.example.com",
       title: "Card " + str(perm.at(i)),
+      tags: if perm.at(i) == 20 {
+        ("tag2", "tag5","loooooonnnnnnnnnnnnnng-tag","some-tag","some-other-tag")
+      } else {
+        (2, 3, 5, 7).filter(j => calc.rem(perm.at(i), j) == 0).map(j => "tag" + str(j))
+      },
       preview-image: summ.preview-image,
       img-copyright: if calc.rem(i, 3) == 0 { [Histausse ] } else { none },
       author: "Me!",