Remove setup.py, and remove sample project from source build

MANIFEST.in

@@ -2,6 +2,5 @@ include pkgutils.py
 include LICENSE.md
 include CREDITS.md
 include CHANGELOG.md
-recursive-include setup *
 recursive-include novelwriter/assets *
-recursive-include sample *.nwx *.nwd
+recursive-include setup *

setup.cfg

@@ -38,7 +38,7 @@ install_requires =
     pyenchant>=3.0.0
 
 [options.packages.find]
-exclude = docs, tests, sample
+include = novelwriter*
 
 [options.entry_points]
 console_script =

setup.py

@@ -1,13 +0,0 @@
-#!/usr/bin/env python3
-
-import setuptools  # noqa: F401
-import warnings  # noqa: F401
-
-warnings.warn(
-    "The setuptools style setup.py script is deprecated and will be "
-    "removed in a future release. Please don't use the 'setup.py install' "
-    "command, and instead use the pip and build commands.",
-    DeprecationWarning
-)
-
-setuptools.setup()