index.typ: added

index.typ

@@ -0,0 +1,19 @@
+// templates for online lecture notes
+
+#import "main.typ": gen_preamble, doc_template, lref
+
+#let template(
+  title: none,
+  authors: none,
+  subtitle: [Index of resources],
+  body
+) = {
+  doc_template({
+    gen_preamble(
+      title: title,
+      authors: authors,
+      prefix: [_#{subtitle}_],
+    )
+    body
+  })
+}