docs(design): remove SVG, use PNG logo only

SVG icon is no longer in use. public/logo.png (1024x1024 RGBA) is
the single logo asset. DESIGN.md updated accordingly: SVG snippet
removed, wordmark pattern and <head> references updated to PNG.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

node_modules/@esbuild/linux-x64/README.md

@@ -0,0 +1,3 @@
+# esbuild
+
+This is the Linux 64-bit binary for esbuild, a JavaScript bundler and minifier. See https://github.com/evanw/esbuild for details.

node_modules/@esbuild/linux-x64/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "@esbuild/linux-x64",
+  "version": "0.21.5",
+  "description": "The Linux 64-bit binary for esbuild, a JavaScript bundler.",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/evanw/esbuild.git"
+  },
+  "license": "MIT",
+  "preferUnplugged": true,
+  "engines": {
+    "node": ">=12"
+  },
+  "os": [
+    "linux"
+  ],
+  "cpu": [
+    "x64"
+  ]
+}