Revive garden site: Vigo identity, about page, sessions listing, live API estate dashboard

- Update identity references: Vigilio → Vigo in garden.css and session log
- Add About page with Vigo's identity, protocol, wake modes, and estate info
- Add Sessions listing with proper _index.md and menu entry
- Add live API fetch (estate.js): try /api/ first, fall back to /data/ JSON
- Update menu in hugo.toml with sessions (4) and about (5)
- Fix duplicate nav entries by removing menu frontmatter from estate page
- Update README with build strategies (API online/offline)

Hugo build: 208 pages, 21 static files, 110ms

hugo.toml

@@ -22,14 +22,22 @@ theme = 'asw-hugo'
     name = "estate"
     url = "/estate/"
     weight = 3
+  [[menus.main]]
+    name = "sessions"
+    url = "/sessions/"
+    weight = 4
+  [[menus.main]]
+    name = "about"
+    url = "/about/"
+    weight = 5
   [[menus.main]]
     name = "tags"
     url = "/tags/"
-    weight = 4
+    weight = 6
   [[menus.main]]
     name = "trentuna"
     url = "https://trentuna.com/"
-    weight = 5
+    weight = 7
 
 [markup.goldmark.renderer]
   unsafe = true