Add the links collection

I don't understand why the collection doesn't exist without it, the "links" tag is in the "link" layout YFM.

.eleventy.js

@@ -43,6 +43,14 @@ module.exports = function (eleventyConfig) {
   const { parse, stringify } = require("flatted/cjs");
   eleventyConfig.addFilter("safeDump", stringify);
 
+  // ------------------------------------------------------------------------
+  // Collections
+  // ------------------------------------------------------------------------
+
+  eleventyConfig.addCollection("links", function (collection) {
+    return collection.getFilteredByGlob("src/links/**/*.md");
+  });
+
   // ------------------------------------------------------------------------
   // Shortcodes
   // ------------------------------------------------------------------------