Theme site with castle logo and earthy palette

Swap the default Quartz palette for warm parchment/terracotta/moss in
light mode and mossy-charcoal/cream in dark mode, picked to harmonize
with the castle logo. Replace icon.png and og-image.png with the
castle artwork (favicon + social previews). Extend PageTitle to render
the logo next to the site title in the sidebar via flex layout.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

quartz.config.ts

@@ -27,26 +27,26 @@ const config: QuartzConfig = {
       },
       colors: {
         lightMode: {
-          light: "#faf8f8",
-          lightgray: "#e5e5e5",
-          gray: "#b8b8b8",
-          darkgray: "#4e4e4e",
-          dark: "#2b2b2b",
-          secondary: "#284b63",
-          tertiary: "#84a59d",
-          highlight: "rgba(143, 159, 169, 0.15)",
-          textHighlight: "#fff23688",
+          light: "#f5ecd9",
+          lightgray: "#d9cdb4",
+          gray: "#a8997b",
+          darkgray: "#4a3e2a",
+          dark: "#2b2316",
+          secondary: "#b8552e",
+          tertiary: "#6b8048",
+          highlight: "rgba(107, 128, 72, 0.15)",
+          textHighlight: "#e8b54066",
         },
         darkMode: {
-          light: "#161618",
-          lightgray: "#393639",
-          gray: "#646464",
-          darkgray: "#d4d4d4",
-          dark: "#ebebec",
-          secondary: "#7b97aa",
-          tertiary: "#84a59d",
-          highlight: "rgba(143, 159, 169, 0.15)",
-          textHighlight: "#b3aa0288",
+          light: "#1c1f1a",
+          lightgray: "#3a3d33",
+          gray: "#7a7361",
+          darkgray: "#e0d4b8",
+          dark: "#f4ead2",
+          secondary: "#d97a55",
+          tertiary: "#9bb87a",
+          highlight: "rgba(155, 184, 122, 0.15)",
+          textHighlight: "#e8b54066",
         },
       },
     },