scripted-diff: Remove unused page attribute share

script:

sed -i --regexp-extended -e '/^\s*share: (false|true|yes)$/d' $(git grep -l 'share:')

Author: MarcoFalke

CONTRIBUTING.md

@@ -81,14 +81,12 @@ defaults:
       type: releases
       layout: page
       lang: en
-      share: true
   - scope:
       path: ""
       type: doc
     values:
       layout: doc
       lang: en
-      share: true
   - scope:
       path: "_posts/en/posts"
       type: posts