add empty pages for gallery, imprint and privacy

ezgg_website/pages/imprint.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+from typing import *  # type: ignore
+
+import rio
+from from_root import from_root
+
+from .page_builder import build_page
+from .. import components as comps
+
+
+class Imprint(rio.Component):
+    def build(self) -> rio.Component:
+        return build_page(rio.Column(
+            comps.NewsPost(
+                header="Impressum",
+                article_text="",
+                date=""
+            )
+        ))