Website source is at https://github.com/SomethingNewUK/somethingnewuk.github.io/ - it's generated using Jekyll, a static compiler. I guess @philipjohn and I are the maintainers at the moment, though I'd love to see better design on it.
I agree the pink bar is horrible, that's my fault. I think keeping the news archive is important - we shouldn't hide what we've said in the past, though if our thinking has moved on, we should write updates and crosslink them.
In the last election, I agree, the thing people found distinctive was how we operate and why, not the details of individual policies.