refactor: Remove old tests and source files (#160)

Co-authored-by: John Halloran <[email protected]>

Author: john-halloran

news/deprecate.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* Old tests and source files from prior, pre-release development.
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>