feat(icons): add cobalt (#1027)

Co-authored-by: Dashboard Icons Manager <193821040+dashboard-icons-manager[bot]@users.noreply.github.com>

tree.json

@@ -289,6 +289,8 @@
         "cloudflare-zero-trust.png",
         "cloudflare.png",
         "cloudpanel.png",
+        "cobalt-dark.png",
+        "cobalt.png",
         "cockpit-cms-light.png",
         "cockpit-cms.png",
         "cockpit-light.png",
@@ -2370,6 +2372,8 @@
         "cloudflare-zero-trust.svg",
         "cloudflare.svg",
         "cloudpanel.svg",
+        "cobalt-dark.svg",
+        "cobalt.svg",
         "cockpit-cms-light.svg",
         "cockpit-cms.svg",
         "cockpit-light.svg",
@@ -4161,6 +4165,8 @@
         "cloudflare-zero-trust.webp",
         "cloudflare.webp",
         "cloudpanel.webp",
+        "cobalt-dark.webp",
+        "cobalt.webp",
         "cockpit-cms-light.webp",
         "cockpit-cms.webp",
         "cockpit-light.webp",