Apply dark-mode unless the page is using its own dark mode

[unixbhaskar]

Describe the bug
Say, I have dark mode enabled for Reddit and LInkedIN, Now if I try to open those page, it malformed and lost it color and representation.
Precise recipe to reproduce the issue
Just open the darkened version and use dark mode again on those.

For website-specific issues:
Can you reproduce this issue with Epiphany / GNOME Web (https://wiki.gnome.org/Apps/Web)?
No other browser showing this : Vimb, firefox
Information

• OS name+version: Gentoo, Slackware, Debian (latest)
• Graphics card and driver: Mesa
• Desktop environment / Window manager name+version: i3 window manager (barebone, No DE)
• How you installed Nyxt (Guix pack, package manager, build from source): Compiled from Source
• Information from show-system-information:
  bhaskar_13:54:14_Mon Feb 12: :~>nyxt --system-information
  Nyxt version: 3.11.2
  Renderer: GI-GTK
  Operating system kernel: Linux 6.7.1-gentoo-dist
  Lisp implementation: SBCL 2.3.5 (Dynamic space size: 3221225472)
  Features: (:NYXT-GI-GTK :NYXT-GTK :NYXT-GI-GTK :NYXT-GTK :NYXT-3.11 :NYXT-3 :NYXT-3.11.2
  :CLIPBOARD-CONTENT-METHOD :SWANK :SLYNK :PLUMP-UTF-32 :PARENSCRIPT :NSYMBOLS
  :FSET-EXT-STRINGS :SBCL+SAFE-STANDARD-READTABLE :NAMED-READTABLES :GLOBAL-VARS
  :CL-FAD :LPARALLEL :21BIT-CHARS :CUSTOM-HASH-TABLE-NATIVE :CL-PPCRE-UNICODE
  :CL-UNICODE :CL-JSON-DOUBLE-FLOAT-IS-SUBSUMED
  :CL-JSON-SINGLE-FLOAT-IS-SUBSUMED :CHUNGA :FLEXI-STREAMS :CL-PPCRE :WEBKIT2
  :WEBKIT-2.42.1 :WEBKIT-2.42 :WEBKIT-2 :WEBKIT2-CORS-ALLOWLIST
  :WEBKIT2-PASTE-PLAINTEXT :WEBKIT2-TRACKING :WEBKIT2-MUTE :WEBKIT2-EMOJI
  :WEBKIT2-MEDIA :WEBKIT2-SANDBOXING :GTK-3-22 :GTK-3-20 :GTK-3-18 :GTK-3-16
  :GTK-3-14 :GTK-3-12 :GTK-3-10 :GTK-3-8 :GTK-3-6 :GTK-3-4 :GTK :GDK-3-22
  :GDK-3-20 :GDK-3-18 :GDK-3-16 :GDK-3-14 :GDK-3-12 :GDK-3-10 :GDK-3-8 :GDK-3-6
  :GDK-3-4 :CAIRO-1-10 :CAIRO-1-12 :GDK-PIXBUF :CLOSER-MOP :GLIB-2-30 :GLIB-2-32
  :GLIB-2-34 :GLIB-2-36 :GLIB-2-38 :GLIB-2-40 :GLIB-2-42 :GLIB-2-44 :GLIB-2-46
  :GLIB-2-48 :GLIB-2-50 :GLIB-2-52 :GLIB-2-54 :GLIB-2-56 :GLIB-2-58 :GLIB
  :BORDEAUX-THREADS :LPARALLEL.WITH-CLTL2 :LPARALLEL.WITH-CAS
  :LPARALLEL.WITH-STEALING-SCHEDULER :SPLIT-SEQUENCE
  CFFI-FEATURES:FLAT-NAMESPACE CFFI-FEATURES:X86-64 CFFI-FEATURES:UNIX :CFFI
  CFFI-SYS::FLAT-NAMESPACE ALEXANDRIA::SEQUENCE-EMPTYP :FAST-IO-SV :FAST-IO
  :CL-JSON-CLOS :CL-JSON :SBCL-USES-SB-ROTATE-BYTE CHIPZ-SYSTEM:GRAY-STREAMS
  :THREAD-SUPPORT :ASDF3.3 :ASDF3.2 :ASDF3.1 :ASDF3 :ASDF2 :ASDF :OS-UNIX
  :NON-BASE-CHARS-EXIST-P :ASDF-UNICODE :ARENA-ALLOCATOR :X86-64 :GENCGC :64-BIT
  :ANSI-CL :COMMON-LISP :ELF :IEEE-FLOATING-POINT :LINUX :LITTLE-ENDIAN
  :PACKAGE-LOCAL-NICKNAMES :SB-CORE-COMPRESSION :SB-LDB :SB-PACKAGE-LOCKS
  :SB-THREAD :SB-UNICODE :SBCL :UNIX)

ASDF version: 3.3.5
ASDF registries: (NYXT-SOURCE-REGISTRY ENVIRONMENT-SOURCE-REGISTRY)
Critical dependencies: (/home/bhaskar/Downloads/nyxt-3.11/_build/cl-cffi-gtk/gtk/cl-cffi-gtk.asd
/home/bhaskar/Downloads/nyxt-3.11/_build/cl-gobject-introspection/cl-gobject-introspection.asd
/home/bhaskar/Downloads/nyxt-3.11/_build/cl-webkit/webkit2/cl-webkit2.asd)

If you can't run show-system-information, try nyxt --system-information from
a shell. It this still does not work, please provide the following:

• Nyxt version (from the nyxt-version command or nyxt --version from a shell):
• Lisp implementation/version (if built from source):
• Kernel name+version: 6.7.1
• WebKitGTK+ | QtWebEngine version:

Output when started from a shell

[aadcg]

The check could be made via JS.

Also, dark-mode could be enabled on URLs matching a certain predicate via auto-rules. Visit nyxt:manual#auto-rules from Nyxt.

[unixbhaskar]

The check could be made via JS.

Also, dark-mode could be enabled on URLs matching a certain predicate via auto-rules. Visit nyxt:manual#auto-rules from Nyxt.

Gotcha!! :)