Packaging: Adjust MANIFEST.in, reflecting recent updates

Author: amotl

MANIFEST.in

@@ -1,5 +1,5 @@
 include LICENSE
-include *.rst
-recursive-include docs *.txt
-recursive-include src *.txt *.rst
-recursive-exclude src tests*.py
+include NOTICE
+include *.rst *.txt
+recursive-include docs *.rst *.txt *.py *.conf
+prune docs/.crate-docs