.eleventy.js: allow paths that start with .. to be rewritten from .md

.eleventy.js

@@ -164,7 +164,7 @@ module.exports = function (eleventyConfig) {
       const startURL = this.inputPath.substring(1, lastSlashIndex + 1);
       return content
         .replace(
-          /<a( class="[\w\-]+")? href="\.\/([\w\-\/]+)\.md(#[\w+\-]+)?"/g,
+          /<a( class="[\w\-]+")? href="\.?\.\/([\w\-\/]+)\.md(#[\w+\-]+)?"/g,
           `<a$1 href="${startURL}$2/$3"`
         )
         .replace("/index/", "/");