broken symlinks

Nobody has claimed this yet.

I'm unable to build or serve the jekyll site locally due to symlinks that point to absolute paths that are specific to @ian29's machine:

```
~/Development/sandy $ jekyll build
Configuration file: none
Source: /Users/john/Development/sandy
Destination: /Users/john/Development/sandy/_site
Generating... error: No such file or directory @ rb_sysopen - /Users/john/Development/sandy/tiles/tilemill/sandy/layers/al052012lin/al052012_lin.dbf. Use --trace to view backtrace
~/Development/sandy $ ll /Users/john/Development/sandy/tiles/tilemill/sandy/layers/al052012lin
total 32
drwxr-xr-x 6 john staff 204 Jan 27 13:50 .
drwxr-xr-x 12 john staff 408 Jan 27 13:50 ..
lrwxr-xr-x 1 john staff 71 Jan 27 13:50 al052012_lin.dbf -> /Users/ianvilleda/Downloads/al052012_best_track_latest/al052012_lin.dbf
lrwxr-xr-x 1 john staff 71 Jan 27 13:50 al052012_lin.prj -> /Users/ianvilleda/Downloads/al052012_best_track_latest/al052012_lin.prj
lrwxr-xr-x 1 john staff 71 Jan 27 13:50 al052012_lin.shp -> /Users/ianvilleda/Downloads/al052012_best_track_latest/al052012_lin.shp
lrwxr-xr-x 1 john staff 71 Jan 27 13:50 al052012_lin.shx -> /Users/ianvilleda/Downloads/al052012_best_track_latest/al052012_lin.shx
```

I suspect this is a problem in production too, because https://www.mapbox.com/sandy/ is a 404.

Do we need to keep this working?

Start by running `jekyll build` and inspecting the symlinks under `tiles/tilemill/sandy/layers/al052012lin`, especially the links targeting `/Users/ianvilleda/Downloads/...`. Check whether the production site at `https://www.mapbox.com/sandy/` is affected. Done means the site can build and serve locally without machine-specific paths and the production URL no longer returns 404.

Written by the indexing model from the issue text.