add user texts and text detail pages

new /texts page lets a user manage their own texts (list +
create form linking to /texts/{id}); /texts/{id} reuses
text.js for the node tree, with a back link to /texts. home
gains a 'My texts' link in the header. the admin texts page
now sources its cross-user list from /api/texts/all.

public/js/texts.js

@@ -3,17 +3,18 @@ document.addEventListener('DOMContentLoaded', () => {
     const form = document.getElementById('texts-form');
 
     async function loadTexts() {
-        const res = await fetch('/api/texts', {
+        const res = await fetch('/api/texts/all', {
             credentials: 'same-origin',
         });
         const texts = await res.json();
-        textsList.innerHTML = texts.map(text =>
-            '<li class="card"><a class="card-link"'
+        textsList.innerHTML = texts.map(function (text) {
+            return '<li class="card"><a class="card-link"'
                 + ' href=/admin/texts/'
                 + text.id
                 + '>'
                 + text.name
-                + '</a></li>').join('');
+                + '</a></li>';
+        }).join('');
     }
 
     form.addEventListener('submit', async (e) => {