Update Website, fix broken references / issues

I've done an extensive first pass with the v0.11 release, but it looks like there's still some cleaning up to do, ~perhaps something @joelreymont you would be interested in tackling~

Get the following to pass (run from project root):
```bash
cd docs
julia --project --color=yes -e '
             using Pkg; Pkg.instantiate();
             include("make.jl")'
```