Fix bug: href attribute of social profile links is incorrect

Fix #116
Add new meta data series_title to use with multipart plugin

Close #95
Fixed issue where tipue search json file generated 301
Display article summary in index.html
Add humans link.
French translation.
Update font-awesome and use minified version.
Set HTML lang based on article.lang.
Change share post link.
Use Roboto font all around the place.