Update root deployment URLs and auth cookie path for non-/mvlog hosting

auth.php

@@ -7,7 +7,7 @@ function mvlog_session_start(): void {
     session_name('MVLOGSESSID');
     session_set_cookie_params([
         'lifetime' => 0,
-        'path' => '/mvlog',
+        'path' => '/',
         'secure' => $secure,
         'httponly' => true,
         'samesite' => 'Strict',
@@ -39,7 +39,7 @@ function mvlog_current_user(): ?string {
 
 function mvlog_require_login(): void {
     if (mvlog_current_user() !== null) return;
-    $next = $_SERVER['REQUEST_URI'] ?? '/mvlog/new.php';
+    $next = $_SERVER['REQUEST_URI'] ?? '/new.php';
     header('Location: login.php?next=' . rawurlencode($next));
     exit;
 }

index.php

@@ -284,6 +284,10 @@ $siteHeaderTitle = $headerTitles[array_rand($headerTitles)];
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width,initial-scale=1">
 <title>MVL</title>
+<meta property="og:title" content="MVL">
+<meta property="og:description" content="journal of an unreliable narrator.">
+<meta property="og:image" content="https://bubulescu.org/assets/img/moto_travel.png">
+<meta property="og:url" content="https://bubulescu.org">
 <link rel="alternate" type="application/rss+xml" title="MVLog RSS" href="feed.php">
 <link rel="icon" type="image/png" href="assets/img/moto_travel.png">
 <link rel="stylesheet" href="style.css">

lib/send_push.php

@@ -169,7 +169,7 @@ function try_send_show_notification($articleRefOrJob, $jobdir, $mvlog_root = nul
 
     if ($articleTitle === '') $articleTitle = mvlog_nice_title((string)$job);
 
-    $filterUrl = 'https://bubulescu.org/mvlog/?' . http_build_query([
+    $filterUrl = 'https://bubulescu.org/?' . http_build_query([
         'q' => $articleTitle,
     ]);