Improve Facebook Open Graph Meta Tags

* Use `og:image` instead of `og:image:url`
* Change `og:type` to `"website"`
Merge pull request #157 from tf/fb-meta-tags

Improve Facebook Open Graph Meta Tags
update changelog
Update Widgets in Editor after Sync
Merge branch 'widgets' into edge-swr
Merge branch 'master' into edge-swr