feat(platform): shared nav shell and common footer config

Signed-off-by: Anton Afanasyeu <a.afanasieff@gmail.com>

platform/footer.config.example.php

@@ -21,11 +21,11 @@ return [
 
     // --- Default left column when `left` is null ---
     // Use holder_name + holder_url for a safe link (holder HTML is escaped if used alone).
-    'holder_name' => 'Anton Afanaasyeu',
+    'holder_name' => 'Anton Afanasyeu',
     'holder_url' => 'https://f0xx.org',
     'holder' => null,
-    'copyright_symbol' => "\u{00A9}",
-    'show_year' => false,
+    'copyright_symbol' => '',
+    'show_year' => true,
     // null = current calendar year at render time (end of range).
     'year' => null,
     // Integer start year. With year_through_current: "2026 - current" (literal suffix).