Remove importable package warnings during python -m build, use conda.txt instead of pip.txt (#223)

* Add __init__.py for static files, use conda.txt

* Add news for warning fix and conda.txt

* Fix typo in news

Author: bobleesj

news/build-warning.rst

@@ -0,0 +1,24 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* fix "absent from setuptools' packages configuration" warnings during python -m build
+* use conda.txt instead of run.txt for conda package dependencies
+
+**Security:**
+
+* <news item>