update `pandoc` data dir

pandoc/bavbavhaus.net.lua

@@ -107,6 +107,17 @@ BACKLINKS, FORELINKS = (function(pages)
   return backlinks, forelinks
 end)(PAGES)
 
+do
+  print("[INFO] bavbavhaus.net: updating index page")
+  local index = "README.md"
+  FORELINKS[index] = pandoc.MetaList({})
+  for i,page in ipairs(PAGES) do
+    if PAGES[i]["meta"]["input_file"] == index then goto continue end
+    FORELINKS[index]:insert(page["meta"]["input_file"])
+    ::continue::
+  end
+end
+
 do
   print("[INFO] bavbavhaus.net: updating link targets")
   local split_extension = pandoc.path.split_extension