add crystal post, small style tweaks

components/content/ProseImg.vue

@@ -0,0 +1,16 @@
+<script setup lang="ts">
+withDefaults(
+    defineProps<{
+        src: string;
+        alt: string | undefined;
+    }>(),
+    {
+        src: '',
+        alt: '',
+    }
+);
+</script>
+
+<template>
+        <img class="mx-auto" :src="src" :alt="alt" />
+</template>