Add ability to delete user icon (#3383)

* Add user icon delete route

By request of moderation, but also just generally nice to have

* Add relevant docs and frontend

* Add v2 version

packages/ui/src/utils/common-messages.ts

@@ -153,6 +153,10 @@ export const commonMessages = defineMessages({
     id: 'button.upload-image',
     defaultMessage: 'Upload image',
   },
+  removeImageButton: {
+    id: 'button.remove-image',
+    defaultMessage: 'Remove image',
+  },
   visibilityLabel: {
     id: 'label.visibility',
     defaultMessage: 'Visibility',