feat(icons): add donetick (#963)

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

tree.json

@@ -422,6 +422,7 @@
         "dolphin.png",
         "domainmod.png",
         "domoticz.png",
+        "donetick.png",
         "dopplertask.png",
         "double-take-dark.png",
         "double-take.png",
@@ -2446,6 +2447,7 @@
         "docuseal.svg",
         "dokemon.svg",
         "dokuwiki.svg",
+        "donetick.svg",
         "double-take-dark.svg",
         "double-take.svg",
         "dovecot.svg",
@@ -4256,6 +4258,7 @@
         "dolphin.webp",
         "domainmod.webp",
         "domoticz.webp",
+        "donetick.webp",
         "dopplertask.webp",
         "double-take-dark.webp",
         "double-take.webp",