Update about file with less sketchy loading system

Remove importlib usage from about file
Add tests to enforce data consistency between pyproject and about
Update sphinx config to use new about file
Remove pyproject from package

tests/test_about.py

@@ -0,0 +1,22 @@
+from pathlib import Path
+
+import toml
+
+from keyosk import __about__
+
+
+PYPROJECT_PATH = Path("pyproject.toml")
+
+
+def test_version():
+    with PYPROJECT_PATH.open() as infile:
+        pyproject = toml.load(infile)
+
+    assert __about__.__version__ == pyproject["tool"]["poetry"]["version"]
+
+
+def test_title():
+    with PYPROJECT_PATH.open() as infile:
+        pyproject = toml.load(infile)
+
+    assert __about__.__title__ == pyproject["tool"]["poetry"]["name"]