Added new OSSF logo
Change the language code of blog

Signed-off-by: Jim Yeh <lemonlatte@gmail.com>
Change OSSF logo
Modify font-family; Darken font color
Restore font color in .brick
Featured: Call for Proposals on nav bar.
Using request language code in the CfP blog URL prefix.
Using same color of emphasis red. Highlighted sponsors' names.
Somewhat elegant grey hr? Or, no more strange white hr by bootstrap.
Added social buttons to our fan pages & groups
Added responsive border radius of header for mobile screen candy.
Unacceptable image size of site logo for mobile network.
Padding-bottom makes brick look better on mobile.
Refactor: let's go 4 spaces with custom.css for now.
"Traditional Chinese" -> "中文"
Using "Language" string in English on Chinese interface and "語言" on English interface.
Relayout navigation bar
Fixed nowrap bug
Fixed nowrap bug
Active page highlight in navbar