chore: add attribution for discord role icons, upscale to 96x96

assets/social/role_icons/README.md

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+### Credits
+
+All icons are from [Icons8](https://icons8.com/license)
+
+#### core
+
+![core](./teal_core.png)
+
+<a target="_blank" href="https://icons8.com/icon/87404/shield">Shield</a> icon
+by <a target="_blank" href="https://icons8.com">Icons8</a> +
+<a target="_blank" href="https://icons8.com/icon/103475/cat-footprint">Cat
+Footprint</a> icon by <a target="_blank" href="https://icons8.com">Icons8</a>
+
+#### staff
+
+![staff](./mauve_staff.png)
+
+<a target="_blank" href="https://icons8.com/icon/86879/name-tag">Name Tag</a>
+icon by <a target="_blank" href="https://icons8.com">Icons8</a>
+
+#### dev
+
+![devs](./lavender_dev.png)
+
+<a target="_blank" href="https://icons8.com/icon/38389/git">Git</a> icon by
+<a target="_blank" href="https://icons8.com">Icons8</a>
+
+#### contributor
+
+![contributors](./blue_contributor.png)
+
+<a target="_blank" href="https://icons8.com/icon/120907/pull-request">Pull
+Request</a> icon by <a target="_blank" href="https://icons8.com">Icons8</a>