docs: modernize pkgdown config (#20)

To not lose search with the new version

Author: maelle

_pkgdown.yml

@@ -1,20 +1,17 @@
+url: https://docs.ropensci.org/rdefra
 navbar:
-  title: ~
-  type: default
-  left:
-  - text: Reference
-    href: reference/index.html
-  - text: Articles
+  structure:
+    left:  [intro, reference, articles, tutorials, news]
+    right: [search, github, lightswitch]
+components:
+  articles:
+    text: Articles
     menu:
     - text: JOSS paper
       href: https://www.doi.org/10.21105/joss.00051
     - text: Vignette
       href: articles/index.html
-  - text: News
-    href: news/index.html
-  right:
-  - icon: fa-github fa-lg
-    href: https://github.com/ropensci/rdefra
+
 
 articles:
 - title: All articles