Decapod's server contains hardcoded paths in a number of places

The Decapod server has hardcoded paths in a number of locations:

1. In dserver.conf, the configuration file used to set CherryPy static mount points (tools.staticdir.root)
2. In both copy/pasted version of the server's capture() method (a path to Capture.html)

These should be removed to reduce brittleness and assumptions about how the file system is laid out.