readme/init has incorrect reference to README.yaml

To recreate:

(main) directory $ make readme/init
cp: .../directory/build-harness/templates/README.yaml: No such file or directory
README.yaml created!

Proposed fix:

Remove templates/ in path from README_TEMPLATE_YAML variable.

build-harness/modules/readme/Makefile

Line 5 in 0957353

    
           export README_TEMPLATE_YAML := $(if $(findstring http,$(README_YAML)),$(README_YAML),$(BUILD_HARNESS_PATH)/templates/$(README_YAML))

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@JRemitz The README.yaml under build-harness is the source of the README.md for the build-harness repo, not a template.

@osterman Do we want to restore a README.yaml template file to the templates directory, or are we satisfied with now having a template repo that includes the template README.yaml?