feat(icons): add glitchtip (#1420)

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

tree.json

@@ -675,6 +675,7 @@
         "glance.png",
         "glances-light.png",
         "glances.png",
+        "glitchtip.png",
         "glpi.png",
         "gluetun.png",
         "gmail.png",
@@ -2800,6 +2801,7 @@
         "glance.svg",
         "glances-light.svg",
         "glances.svg",
+        "glitchtip.svg",
         "glpi.svg",
         "gluetun.svg",
         "gmail.svg",
@@ -4772,6 +4774,7 @@
         "glance.webp",
         "glances-light.webp",
         "glances.webp",
+        "glitchtip.webp",
         "glpi.webp",
         "gluetun.webp",
         "gmail.webp",