redesign site as "case file" theme

- new paper/ink palette with single red accent, replacing catppuccin
- self-hosted IBM Plex Serif (display) + Source Serif 4 (body), drop Outfit
- rebuilt homepage masthead, numbered post index, navbar with active states
- switch syntax highlighting + utterances to gruvbox, synced via postMessage
- remove terminal/404 easter egg chrome, clean up remaining inline styles
- fix stray syntax.css link causing a 404

cspell.json

@@ -1,75 +0,0 @@
-{
-  "version": "0.2",
-  "language": "en",
-  "words": [
-    "andwati",
-    "angr",
-    "bruteforcing",
-    "buttondown",
-    "catppuccin",
-    "cookieconsent",
-    "DCBA",
-    "disassemblers",
-    "dlresolve",
-    "dnsmasq",
-    "Einherjar",
-    "elasticlunr",
-    "endianness",
-    "Fastbin",
-    "fgets",
-    "fini",
-    "frontmatter",
-    "Ghidra",
-    "Heartbleed",
-    "honggfuzz",
-    "hotspot",
-    "Hotspots",
-    "katex",
-    "kebab",
-    "Kernighan",
-    "libc",
-    "lightbox",
-    "listmonk",
-    "malloc",
-    "markdownlint",
-    "mockingspectre",
-    "nmcli",
-    "objdump",
-    "pacman",
-    "Pgadget",
-    "precommit",
-    "pwn",
-    "pwndbg",
-    "pwnforfunandprofit",
-    "pwntools",
-    "Pwntools",
-    "radare",
-    "readelf",
-    "Ritchie",
-    "Sandboxing",
-    "scanf",
-    "seccomp",
-    "shellcode",
-    "Shellshock",
-    "shortcodes",
-    "Sigreturn",
-    "SIGSEGV",
-    "SROP",
-    "stdlib",
-    "subdirectories",
-    "syscalls",
-    "Tcache",
-    "Userland",
-    "utterances",
-    "webmention",
-    "zola"
-  ],
-  "ignorePaths": [
-    "node_modules",
-    "package.json",
-    "pnpm-lock.yaml",
-    "public",
-    "static/js/**",
-    "static/css/**"
-  ]
-}