Load Lato font for nav header

Author: stefanv

config.yaml

@@ -11,12 +11,15 @@ markup:
       unsafe: true
     renderHooks:
       link:
-        enableDefault: true
+        useEmbedded: fallback
 
 params:
   description: "Documentation for the Scientific Python community."
   images:
     - /images/logo.svg
+  fonts:
+    - name: "Lato"
+      weights: [400, 700]
   navbarlogo:
     image: logo.svg
     text: Learn Scientific Python