Reorganise views/ directory structure to match routes

Move shrines and bookmarks under home/, landing and 404 into own
subdirectories, and retire Notes.vue (served by external service).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

vue/src/views/404/404.vue

@@ -0,0 +1,13 @@
+<template>
+    <main class="flex flex-col items-center">
+        <div
+            class="a4page-portrait items-center bdr-1 flex flex-col relative overflow-scroll"
+        >
+            <h1>404</h1>
+            <RouterLink to="/" class="bdr-2">
+                <img src="/img/memes/epic.jpeg" loading="lazy" />
+            </RouterLink>
+            <h1>Click her, she will take you home</h1>
+        </div>
+    </main>
+</template>