OEL-1160: Remove header pattern.

templates/patterns/header/header.ui_patterns.yml

-header:
-  label: Header
-  description: A navigation section for the header
-  variants:
-    ec:
-      label: European Commission
-    eu:
-      label: European Union
-  fields:
-    navbar_branding:
-      type: array
-      label: "Brand title"
-      description: "Your company, product, or project name."
-      preview:
-        - type: html_tag
-          tag: span
-          value: "Brand"
-    navbar_right:
-      type: array
-      label: Text
-      description: "Vertically centered strings of text."
-      preview: "Navbar text with an inline element"
-    header_top:
-      type: array
-      label: 'Header Top'
-    header_left:
-      type: array
-      label: 'Header Left'
-    header_right:
-      type: array
-      label: 'Header Right'
-    breadcrumbs:
-      type: array
-      label: 'Breadcrumbs'

templates/patterns/header/pattern-header--variant-ec.html.twig

-{#
-/**
- * @file
- * Template override for pattern header variant EC.
- */
-#}
-{% extends "pattern-header.html.twig" %}
-{% block header %}
-  {% set _header_attributes = create_attribute().addClass(['bcl-header--ec', 'bcl-header']) %}
-  {{ parent() }}
-{% endblock %}

templates/patterns/header/pattern-header--variant-eu.html.twig

-{#
-/**
- * @file
- * Template override for pattern header variant EU.
- */
-#}
-{% extends "pattern-header.html.twig" %}
-{% block header %}
-  {% set _header_attributes = create_attribute().addClass(['bcl-header--eu', 'bcl-header']) %}
-  {{ parent() }}
-{% endblock %}

templates/patterns/header/pattern-header.html.twig

-{#
-/**
- * @file
- * Template for header pattern.
- */
-#}
-{% set _nav_attributes = create_attribute().addClass([
-  'w-100',
-  'shadow-sm',
-  'navbar',
-  'navbar-expand-lg',
-  'navbar-light',
-]) %}
-{% set navbar_attributes = create_attribute().addClass(['bcl-header__navbar']) %}
-{% set _header_attributes = create_attribute() %}
-{% set _project_attributes = create_attribute().addClass([
-  'bcl-header__project',
-  bcl_header_style == 'light' ? bcl_header_style,
-]) %}
-{% block header %}
-<header {{ _header_attributes }}>
-{% endblock %}
-  <nav {{ _nav_attributes }}>
-    <div class="container">
-      {{ navbar_branding }}
-      <ul class="nav">
-        {{ navbar_right }}
-      </ul>
-    </div>
-  </nav>
-  <div {{ _project_attributes }}>
-    <div class="container">
-      {{ header_top }}
-    </div>
-  </div>
-  {{ pattern('navbar', {
-    navigation: header_left,
-    right: header_right,
-    color_scheme: 'dark',
-    background: false,
-    attributes: navbar_attributes,
-  }) }}
-  <div class="container">
-    {{ breadcrumbs }}
-  </div>
-</header>