Add GrapheneOS

_includes/sections/mobile-operating-systems.html

@@ -10,7 +10,7 @@
   title="LineageOS"
   image="/assets/img/tools/LineageOS.png"
   url="https://www.lineageos.org/"
-  description="LineageOS is a free and open-source operating system for smartphones and tablets, based on the official releases of Android by Google. It is the continuation of the CyanogenMod project."
+  description="LineageOS is a free and open-source operating system for smartphones and tablets, based on the official releases of the Android Open Source Project. It is the continuation of the CyanogenMod project."
   %}
 
   {% include card.html color="primary"
@@ -20,6 +20,14 @@
   description="Ubuntu Touch is a free and open-source operating system for smartphones and tablets. It's an alternative to the current popular mobile operating systems on the market. Only a few devices are <a href=https://devices.ubuntu-touch.io/>supported.</a>"
   %}
 
+  {% include card.html color="warning"
+  title="GrapheneOS"
+  labels="warning:experimental:GrapheneOS is the successor to CopperheadOS and is still in active development."
+  image="/assets/img/tools/GrapheneOS.png"
+  url="https://grapheneos.org/"
+  description="GrapheneOS is a free and open-source security and privacy focused mobile operating system. It is a hardened fork of the Android Open Source Project that is in active development, and the successor to CopperheadOS."
+  %}
+
 </div>
 
 <h3>Worth Mentioning</h3>