Adiciona bloco MicrositeHeaderBlock e regiões ao tema do microsite

- Novo bloco MicrositeHeaderBlock (site_users_microsite): exibe foto
  circular (220×280px), nome (h1), biografia e contatos (telefone,
  e-mail). Título oculto por padrão; biografia renderizada via
  ->processed com |raw no template.
- Remove UserInfoBlock e seu template (não estava em uso).
- Adiciona regiões Top Bar e Navigation ao tema; menu.html.twig para
  gerar classes .menu__item/.menu__link compatíveis com o CSS.
- CSS: estilos das novas regiões e do bloco de cabeçalho.

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

templates/site-user-info-block.html.twig

@@ -1,63 +0,0 @@
-{#
-/**
- * @file
- * Template for the user information block.
- *
- * Available variables:
- * - user_info: Array with user information:
- *   - uid: User ID
- *   - username: Display name
- *   - name: Full name
- *   - phone: Phone number
- *   - bio: Biography
- *   - social_links: Array of social links, each with 'network' and 'url' keys
- *   - photo_url: Default photo URL
- *   - photo_alt: Photo alternative text
- * - user: User entity.
- */
-#}
-<div class="site-user-info-block">
-  <div class="site-user-info-block__photo">
-    {% if user_info.photo_url %}
-      <img src="{{ user_info.photo_url }}" alt="{{ user_info.photo_alt }}" class="site-user-info-block__image" />
-    {% else %}
-      <div class="site-user-info-block__no-photo">
-        <span class="site-user-info-block__initials">
-          {{ user_info.name ? user_info.name|first|upper : user_info.username|first|upper }}
-        </span>
-      </div>
-    {% endif %}
-  </div>
-
-  <div class="site-user-info-block__details">
-    <h2 class="site-user-info-block__name">
-      {{ user_info.name ?: user_info.username }}
-    </h2>
-
-    {% if user_info.phone %}
-      <div class="site-user-info-block__phone">
-        <span class="site-user-info-block__label">{{ 'Phone:'|t }}</span>
-        <a href="tel:{{ user_info.phone }}">{{ user_info.phone }}</a>
-      </div>
-    {% endif %}
-
-    {% if user_info.bio %}
-      <div class="site-user-info-block__bio">
-        {{ user_info.bio }}
-      </div>
-    {% endif %}
-
-    {% if user_info.social_links %}
-      <div class="site-user-info-block__social-links">
-        {% for link in user_info.social_links %}
-          <a href="{{ link.url }}"
-             class="social-link social-link--{{ link.network }}"
-             target="_blank"
-             rel="noopener noreferrer">
-            {{ link.network }}
-          </a>
-        {% endfor %}
-      </div>
-    {% endif %}
-  </div>
-</div>