feat: update nosotros hero photo and trim team gallery to two photos

Replace the hero image with a real event photo, and remove the third
support photo from the team gallery. Also drop the now-orphaned
last-child full-span rule so the remaining two photos sit as equal
side-by-side columns instead of one stretching full width.

src/pages/nosotros.astro

@@ -5,6 +5,13 @@ import Icon from '../components/Icon.astro';
 
 const whatsappAriaLabel = 'Contactar con MNQ por WhatsApp';
 
+const heroPhoto = {
+  src: '/images/nosotros-hero.webp',
+  alt: 'Responsable de MNQ acompañando la puesta a punto de un evento nocturno',
+  width: 1014,
+  height: 747,
+};
+
 const teamGallery = {
   lead: {
     src: '/images/team/mnq-team-lead.webp',
@@ -30,14 +37,6 @@ const teamGallery = {
       pos: 'center center',
       caption: 'Cocina en movimiento, detalle en cada pase.',
     },
-    {
-      src: '/images/team/mnq-team-close.webp',
-      alt: 'Momento cercano del equipo de MNQ',
-      width: 1079,
-      height: 1079,
-      pos: 'center center',
-      caption: 'Una presencia cercana que acompaña sin invadir.',
-    },
   ],
 };
 ---
@@ -64,11 +63,11 @@ const teamGallery = {
         <div class="nosotros-image" style="position:relative;">
           <div class="overflow-hidden rounded-lg" style="aspect-ratio:4/3;">
             <img
-              src={teamGallery.lead.src}
-              alt={teamGallery.lead.alt}
-              width={teamGallery.lead.width}
-              height={teamGallery.lead.height}
-              style={`width:100%;height:100%;object-fit:cover;object-position:${teamGallery.lead.pos};`}
+              src={heroPhoto.src}
+              alt={heroPhoto.alt}
+              width={heroPhoto.width}
+              height={heroPhoto.height}
+              style="width:100%;height:100%;object-fit:cover;object-position:center;"
               loading="eager"
               fetchpriority="high"
             />
@@ -300,10 +299,6 @@ const teamGallery = {
     .team-support-grid {
       grid-template-columns: repeat(2, minmax(0, 1fr));
     }
-
-    .team-support-grid > :last-child {
-      grid-column: 1 / -1;
-    }
   }
 
   @media (min-width: 64rem) {