feat: add custom icons to the website

This commit adds icons from various sources as a single font file to the website. Icons can be
inserted with the new Icon component.

content/.vuepress/components/Icon.vue

@@ -0,0 +1,17 @@
+<template>
+  <i :class="`icon phunic-${props.name}`" />
+</template>
+
+<script setup lang="ts">
+const props = defineProps({
+  name: {
+    default: '',
+    required: true,
+    type: String,
+  },
+});
+</script>
+
+<style lang="less">
+@import '../styles/fonts.less';
+</style>