Add SMO to archives page
Add SMO to tags page
Move og:type and twitter:card into base.html because it is repeated without any change in every file
Add SMO to categories page
Add SMO to search page
Add support for Google Universal Analytics
Update release notes
No need to use GOOGLE_ANALYTICS_SITE_URL in Universal Analytics code

According to
[documentation](https://developers.google.com/analytics/devguides/collection/analyticsjs/method-reference#create)
third parameter is optional.
Revert "Rename SITESUBTITLE to SITE_SUBTITLE"

This reverts commit e479ce72db916e7e21bc6ae63677221c8e290840.

As [@calfzhou](https://github.com/calfzhou) [pointed
out](https://github.com/talha131/pelican-elegant/commit/e479ce72db916e7e21bc6ae63677221c8e290840#commitcomment-6284503)

> In pelican's document, the default theme uses SITESUBTITLE.
Update thanks file
Fix a bug which will cause site name and menu to move to left on wide displays
Update release notes
merged upstream