moved env spec to root

PySquiggleDraw/environment.yml

@@ -1,15 +0,0 @@
-name: gen-art-env
-channels:
-  - defaults
-dependencies:
-  - jupyterlab
-  - networkx
-  - ipywidgets
-  - numpy
-  - matplotlib
-  - shapely
-  - pycairo
-  - scipy
-  - colour
-  - scikit-image
-  - scour