Remove dead template/asset files; fix licence.php full-width layout

- Delete templates/header.php and templates/head.php — both were legacy
  partials from a previous design iteration (lang="en", broken nav markup)
  that were never included anywhere in the current codebase.

- Delete public/assets/icons.svg — the full TrumboWYG icon sprite (~15 KB)
  referenced nowhere; the only active WYSIWYG editor (EasyMDE in
  pages-edit.php) loads its own assets from CDN.

- Fix licence.php layout: the page was borrowing the two-column
  .apropos-layout grid but leaving the right column always empty, wasting
  ~40% of the viewport. Removed the grid wrapper and the empty .apropos-right
  div. Added .apropos-single utility class to apropos.css (max-width: 720px)
  so licence content now spans the full available width with a readable
  line length.

TODO.md

@@ -463,12 +463,12 @@ Goal: rename the tables and column to the canonical M2M pattern (`tags`, `thesis
       `apropos.php`, `licence.php`, `templates/admin/head.php` all contain the same 6-line
       `(function poll(){…})()` block. Consolidate into the shared head partials.
 
-- [ ] **`templates/header.php` and `templates/head.php` are dead files** — neither is `include`d
+- [x] **`templates/header.php` and `templates/head.php` are dead files** — neither is `include`d
       anywhere in the codebase. Both contain outdated markup from a previous design iteration
       (`lang="en"`, empty author meta, a broken nav with double-quoted `href` attributes inside
       `href`). Delete both to remove confusion.
 
-- [ ] **`public/assets/icons.svg` is dead** — it is the full TrumboWYG editor icon sprite (40+
+- [x] **`public/assets/icons.svg` is dead** — it is the full TrumboWYG editor icon sprite (40+
       symbols) referenced **nowhere** in the codebase. The only WYSIWYG editor in use (EasyMDE
       in `pages-edit.php`) loads from CDN. Delete `icons.svg` (~15 KB of noise).
 
@@ -525,10 +525,10 @@ Goal: rename the tables and column to the canonical M2M pattern (`tags`, `thesis
       require a code deploy to change. Either move them into the `about` page Markdown (admin-
       editable) or extract to a config array so they are in one place.
 
-- [ ] **`licence.php` wastes half the viewport with an always-empty right column** — the page
+- [x] **`licence.php` wastes half the viewport with an always-empty right column** — the page
       reuses the two-column `.apropos-layout` but `<div class="apropos-right"></div>` is always
-      empty. Add a `.apropos-layout--single` variant (or just `grid-template-columns:1fr` when
-      the right child is empty) to use the full width for content.
+      empty. Added `.apropos-single` class + removed layout wrapper; content now uses full width
+      (max-width: 720px) without an empty right column.
 
 ### G — Accessibility & semantics
 

public/assets/apropos.css

@@ -29,6 +29,11 @@ html, body {
   max-width: 1200px;
 }
 
+/* Single-column layout — used by licence.php (no right column) */
+.apropos-single {
+  max-width: 720px;
+}
+
 /* Left col — main description text in big monospace */
 .apropos-left {}
 

public/licence.php

@@ -47,17 +47,12 @@ $html = $pd->text($content);
     <?php include APP_ROOT . '/templates/search-bar.php'; ?>
 
     <main class="apropos-main" id="main-content">
-        <div class="apropos-layout">
-            <div class="apropos-left">
-                <div class="apropos-description apropos-page-content">
-                    <?php if (!empty(trim($content))): ?>
-                        <?= $html ?>
-                    <?php else: ?>
-                        <p>Contenu à venir.</p>
-                    <?php endif; ?>
-                </div>
-            </div>
-            <div class="apropos-right"></div>
+        <div class="apropos-description apropos-page-content apropos-single">
+            <?php if (!empty(trim($content))): ?>
+                <?= $html ?>
+            <?php else: ?>
+                <p>Contenu à venir.</p>
+            <?php endif; ?>
         </div>
     </main>
 

templates/head.php

@@ -1,32 +0,0 @@
-<!-- head.php - Shared HTML head section -->
-<!DOCTYPE html>
-<html lang="fr">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <meta name="author" content="">
-    <meta name="description" content="">
-    <title><?= isset($pageTitle) ? htmlspecialchars($pageTitle) . ' - Posterg' : 'Posterg' ?></title>
-    <link rel="icon" type="image/svg+xml" href="/assets/admin_favicon.svg">
-    <link rel="stylesheet" href="assets/modern-normalize.min.css">
-    <link rel="stylesheet" href="assets/common.css">
-    <?php if (isset($additionalCSS)): ?>
-        <?php foreach ((array)$additionalCSS as $css): ?>
-            <link rel="stylesheet" href="<?= htmlspecialchars($css) ?>">
-        <?php endforeach; ?>
-    <?php endif; ?>
-    <?php if (php_sapi_name() === 'cli-server'): ?>
-        <!-- Live reload for development -->
-        <script>
-            (function poll() {
-                fetch('/live-reload.php')
-                    .then(r => r.json())
-                    .then(d => {
-                        if (d.changed) location.reload();
-                        else setTimeout(poll, 1000);
-                    })
-                    .catch(() => setTimeout(poll, 2000));
-            })();
-        </script>
-    <?php endif; ?>
-</head>

templates/header.php

@@ -1,48 +0,0 @@
-<!-- header.php -->
-<!DOCTYPE html>
-<html lang="en">
-
-<head>
-    <meta charset="UTF-8">
-    <meta name="author" content="">
-    <meta name="description" content="">
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <title>Posterg</title>
-    <link rel="stylesheet" href="assets/modern-normalize.min.css">
-    <link rel="stylesheet" href="assets/common.css">
-    <link rel="stylesheet" href="assets/main.css">
-    <?php if (php_sapi_name() === 'cli-server'): ?>
-        <!-- Live reload for development -->
-        <script>
-            (function poll() {
-                fetch('/live-reload.php')
-                    .then(r => r.json())
-                    .then(d => {
-                        if (d.changed) location.reload();
-                        else setTimeout(poll, 1000);
-                    })
-                    .catch(() => setTimeout(poll, 2000));
-            })();
-        </script>
-    <?php endif; ?>
-</head>
-
-<body>
-    <header>
-        <a class="title" href="index.php">
-            <h1>posterg</h1>
-        </a>
-        <section>
-            <p class="apropos">
-                Ce site archive et valorise les mémoires de l'ERG (Bruxelles). Il expose les projets des diplômé·es pour illustrer la diversité des parcours qui marquent l'histoire centenaire de l'école.
-            </p>
-            <p class="colophon">
-                Design & développement : Olivia Marly, Théo Hennequin & Théophile Gervreau-Mercie
-                Typographies : Ductus (Amélie Dumont), Hyphont-e
-            </p>
-        </section>
-        <nav role="navigation" aria-label="main navigation">
-            <button><a href="search.php"">Recherche</a></button>
-            <button><a href=" search.php"">Partager</a></button>
-        </nav>
-    </header>