add link to external CSS snippets

locales/en-US.yml

@@ -928,6 +928,7 @@ setCategory: "Set category"
 setTag: "Set tag"
 addTag: "Add tag"
 removeTag: "Remove tag"
+externalCssSnippets: "Some CSS snippets for your inspiration (not managed by FoundKey)"
 _emailUnavailable:
   used: "This email address is already being used"
   format: "The format of this email address is invalid"

packages/client/src/pages/settings/custom-css.vue

@@ -5,6 +5,8 @@
 	<FormTextarea v-model="localCustomCss" manual-save tall class="_monospace _formBlock" style="tab-size: 2;">
 		<template #label>CSS</template>
 	</FormTextarea>
+
+	<a href="https://github.com/JakeMBauer/Misskey-Extras/tree/master/custom-css">{{ i18n.ts.externalCssSnippets }}</a>
 </div>
 </template>