Added sensible default front matter values

* correct layout for posts and pages is set by default
* author sidebar box is added by default to posts and pages
* author value is set to "Jim Martens" for all posts by default

Signed-off-by: Jim Martens <github@2martens.de>

_config.yml

@@ -13,6 +13,23 @@ description: > # this means to ignore newlines until "baseurl:"
   related to me personally.
 baseurl: "" # the subpath of your site, e.g. /blog
 url: "http://jim.2martens.de" # the base hostname & protocol for your site
+defaults:
+  -
+    scope:
+      path: ""
+      type: "posts"
+    values:
+      layout: "post"
+      author: "Jim Martens"
+      sidebarboxes: "author"
+  -
+      scope:
+        path: ""
+        type: "pages"
+      values:
+        layout: "page"
+        sidebarboxes: "author"
+
 
 # Build settings
 markdown: kramdown