fix: SEO canonical URLs, LCP performance, remove unused dependencies

- Remove duplicate app/projects/ route (was causing 5xx and soft 404)
- Fix nginx: redirect www.dk0.dev → dk0.dev (non-www canonical)
- Fix not-found.tsx: locale-prefixed links, remove framer-motion dependency
- Add fetchPriority='high' and will-change to Hero LCP image
- Add preconnect hints for hardcover.app and cms.dk0.dev
- Reduce background blur from 100px to 80px (LCP rendering delay)
- Remove boneyard-js (~20 KiB), replace with custom Skeleton component
- Remove react-icons (~10 KiB), replace with inline SVGs
- Conditionally render mobile menu (saves ~20 DOM nodes)
- Add /books to sitemap
- Optimize image config with explicit deviceSizes/imageSizes

package-lock.json

@@ -20,7 +20,6 @@
         "@tiptap/react": "^3.15.3",
         "@tiptap/starter-kit": "^3.15.3",
         "@vercel/og": "^0.6.5",
-        "boneyard-js": "^1.7.6",
         "clsx": "^2.1.1",
         "dotenv": "^16.6.1",
         "framer-motion": "^12.24.10",
@@ -32,7 +31,6 @@
         "nodemailer": "^7.0.11",
         "react": "^19.2.3",
         "react-dom": "^19.2.3",
-        "react-icons": "^5.5.0",
         "react-markdown": "^10.1.0",
         "redis": "^5.8.2",
         "sanitize-html": "^2.17.0",
@@ -596,13 +594,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/@chenglou/pretext": {
-      "version": "0.0.5",
-      "resolved": "https://registry.npmjs.org/@chenglou/pretext/-/pretext-0.0.5.tgz",
-      "integrity": "sha512-A8GZN10REdFGsyuiUgLV8jjPDDFMg5GmgxGWV0I3igxBOnzj+jgz2VMmVD7g+SFyoctfeqHFxbNatKSzVRWtRg==",
-      "license": "MIT",
-      "optional": true
-    },
     "node_modules/@cspotcode/source-map-support": {
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
@@ -5445,53 +5436,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/boneyard-js": {
-      "version": "1.7.6",
-      "resolved": "https://registry.npmjs.org/boneyard-js/-/boneyard-js-1.7.6.tgz",
-      "integrity": "sha512-9K3+cD684J131itS2iUI1+dsWqE7K3hSZid0nyXeBxtSTWQTFSpnGM7xmup16QwtmeGR70MPvpzluhA2Nl5LuQ==",
-      "license": "MIT",
-      "dependencies": {
-        "playwright": "^1.58.2"
-      },
-      "bin": {
-        "boneyard-js": "bin/cli.js"
-      },
-      "optionalDependencies": {
-        "@chenglou/pretext": "^0.0.5"
-      },
-      "peerDependencies": {
-        "@angular/core": ">=14",
-        "preact": ">=10",
-        "react": ">=18",
-        "react-native": ">=0.71",
-        "svelte": ">=5.29",
-        "vite": ">=5",
-        "vue": ">=3"
-      },
-      "peerDependenciesMeta": {
-        "@angular/core": {
-          "optional": true
-        },
-        "preact": {
-          "optional": true
-        },
-        "react": {
-          "optional": true
-        },
-        "react-native": {
-          "optional": true
-        },
-        "svelte": {
-          "optional": true
-        },
-        "vite": {
-          "optional": true
-        },
-        "vue": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/boolbase": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz",
@@ -12070,6 +12014,7 @@
       "version": "1.58.2",
       "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.58.2.tgz",
       "integrity": "sha512-vA30H8Nvkq/cPBnNw4Q8TWz1EJyqgpuinBcHET0YVJVFldr8JDNiU9LaWAE1KqSkRYazuaBhTpB5ZzShOezQ6A==",
+      "devOptional": true,
       "license": "Apache-2.0",
       "dependencies": {
         "playwright-core": "1.58.2"
@@ -12088,6 +12033,7 @@
       "version": "1.58.2",
       "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.58.2.tgz",
       "integrity": "sha512-yZkEtftgwS8CsfYo7nm0KE8jsvm6i/PTgVtB8DL726wNf6H2IMsDuxCpJj59KDaxCtSnrWan2AeDqM7JBaultg==",
+      "devOptional": true,
       "license": "Apache-2.0",
       "bin": {
         "playwright-core": "cli.js"
@@ -12681,15 +12627,6 @@
         "react": "^19.2.4"
       }
     },
-    "node_modules/react-icons": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/react-icons/-/react-icons-5.5.0.tgz",
-      "integrity": "sha512-MEFcXdkP3dLo8uumGI5xN3lDFNsRtrjbOEKDLD7yv76v4wpnEq2Lt2qeHaQOr34I/wPN3s3+N08WkQ+CW37Xiw==",
-      "license": "MIT",
-      "peerDependencies": {
-        "react": "*"
-      }
-    },
     "node_modules/react-is": {
       "version": "17.0.2",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",