Add edit page, dialog based item page. Consider switching to popups.

inventory/pages/settings_page.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from dataclasses import KW_ONLY, field
+from typing import *  # type: ignore
+
+import rio
+
+from .. import components as comps
+
+class SettingsPage(rio.Component):
+    """
+    A sample page, which displays a humorous description of the company.
+    """
+
+    def build(self) -> rio.Component:
+        return rio.Markdown(
+            """
+Belden Inventory manager v0.5
+WIP
+            """,
+            min_width=60,
+            margin_bottom=4,
+            align_x=0.5,
+            align_y=0,
+        )
+