Fixes for about homepage and navigation

docs/about-ensembl/index.md

----
-slug: about-ensembl
-title: About Ensembl
-description: An introduction to the Ensembl project and this website
-status: draft
----
-
-# About Ensembl
-
-(Home page for this app - initially a brief overview of this new site's roadmap and purpose, to orient the user and set expectations. Andrea/web to provide first draft.)

docs/about-ensembl/toc.yml

@@ -3,4 +3,4 @@
   url: /about
 - name: Legal & privacy
   href: legal-and-privacy/toc.yml
-  url: /about/articles/legal-and-privacy
+  url: /about/articles/legal