feat: apply Nord theme to glow markdown renderer

- Add .config/glow/nord.json — full glamour style using Nord palette
  (Polar Night bg, Frost headings, Aurora syntax, Snow Storm text)
- Configure glow.yml to use the Nord style by default
- Track both glow files in .gitignore whitelist

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

.config/glow/glow.yml

@@ -0,0 +1,8 @@
+# style name or JSON path (default "auto")
+style: "/home/valknar/.config/glow/nord.json"
+# mouse support (TUI-mode only)
+mouse: false
+# use pager to display markdown
+pager: false
+# word-wrap at width
+width: 80