UI fixes

[apexkid]

• Contest filters need to be drop down as platform > 10
• Add filter named 'others' for prized/hiring
• Improve UI twitter box
• Improve footer UI. Make space between container and footer
• Fix Min height of Contest board
• Reduce height of header in overlay mode
• Remove sign in option from main page. It is private link
• Add logout option on admin sign-in
  Improve UI for "/contest/edit/2", "/contest/add", "contest/view",
  Bind some action to Click on the contest box
  Move Byteboard "text" to Byteboard "image"