website: CSS fixes

[tomtseng]

CSS fixes to website refactor introduced by #103:

• Bold font for active link in navbar
• Make download icon visible in game list table
• remove excess margin below links below ttitle

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[AdamGleave]

I reviewed this last night and it LGTM but I couldn't post it as on my phone which wasn't logged in to GH, glad we communicated telepathically somehow about this :)