fix background, add news

_pkgdown.yml

@@ -18,21 +18,27 @@ development:
   mode: auto
 
 navbar:
-  bg: dark
   structure:
     left:
     - intro
     - reference
+    - news
     right: github
   components:
     reference:
       text: Documentation
       href: reference/index.html
+    news:
+      text: News
+      href: news/index.html
     github:
       icon: fab fa-github fa-lg
       href: https://github.com/drieslab/GiottoClass/
       aria-label: github
 
+news:
+  cran_dates: false
+
 home:
   sidebar:
     structure: [links, license, community, citation, authors, dev]