Add docs config

Update setup remove ipympl dependency
Update Project Name
add build to Makefile

stree/.readthedocs.yaml

@@ -0,0 +1,10 @@
+version: 2
+
+sphinx:
+  configuration: docs/source/conf.py
+
+python:
+  version: 3.8
+  install:
+    - requirements: requirements.txt
+    - requirements: docs/requirements.txt