🎨 Disabled auto-linking of domain names in markdown (#9084)

closes https://github.com/TryGhost/Ghost/issues/8987

- set `linkify-it` `fuzzyLink` option to false so that it only auto-links URLs starting with `http(s)://` or other valid schemes

core/server/utils/markdown-converter.js

@@ -1,4 +1,4 @@
-var MarkdownIt  = require('markdown-it'),
+var MarkdownIt = require('markdown-it'),
     converter = new MarkdownIt({
         html: true,
         breaks: true,
@@ -44,6 +44,11 @@ var MarkdownIt  = require('markdown-it'),
         // jscs:enable
     });
 
+// configure linkify-it
+converter.linkify.set({
+    fuzzyLink: false
+});
+
 module.exports = {
     render: function (markdown) {
         return converter.render(markdown);