Event dashboard expansion

Ideas brainstormed with @Thrainsa. Related to #475 as we need to gain space in the event navbar, it would never support 8+ links.

Combine the event home page + the event dashboard into a single page
Make the user's blog posts less prominent (maybe even only feature the latest one), in the sidebar
Make the latest announcement entirely visible
Consider a pretty section matching the event timeline with relevant blocks according to theme voting > entry submission > voting results

akj_dashboard

Themed header:

Untitled-1

alakajam-team / alakajam