Remove Default Template Config

[ColonelPanics]

In etc/templates.yaml we have the following:

default:
  default: server.md.erb
data:
  default: asset.yml.erb
markdown:
  default: server.md.erb
  server: server.md.erb
  switch: switch.md.erb
flightcenter:
  default: serverFC.md.erb
  server: serverFC.md.erb
  switch: switchFC.md.erb

As I understand it, inventory show will use the default map. This seems a little redundant to me. Could we not default to say, data or markdown? (markdown being my default preference).

The issue is that now the default template list will need to be maintained for different assets types, instead of the just the different outputs. (This was somewhat touched upon in #117 ).