feat(icons): add alexa (#1192)

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

tree.json

@@ -30,6 +30,7 @@
         "alarmpi.png",
         "albert-heijn.png",
         "alertmanager.png",
+        "alexa.png",
         "algo.png",
         "aliexpress.png",
         "alist.png",
@@ -2243,6 +2244,7 @@
         "akkoma.svg",
         "albert-heijn.svg",
         "alertmanager.svg",
+        "alexa.svg",
         "aliexpress.svg",
         "alist.svg",
         "alloy.svg",
@@ -4025,6 +4027,7 @@
         "alarmpi.webp",
         "albert-heijn.webp",
         "alertmanager.webp",
+        "alexa.webp",
         "algo.webp",
         "aliexpress.webp",
         "alist.webp",