Update issue templates

.github/ISSUE_TEMPLATE/icon-request.md

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+---
+name: Icon request
+about: Request an icon you'd like to see added
+title: ''
+labels: enhancement
+assignees: rektdeckard
+
+---
+
+**Describe the requested icon**
+Explain the icon you'd like to see, and potential use-cases.
+
+**Screenshots**
+If applicable, add screenshots to help illustrate the icon appearance.
+
+**Additional context**
+Add any other context here.