Add breadcrumbs, navbar and blog listing for bs4

foundation/templates/includes/breadcrumbs.html

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+{% if parents and parents|length > 0 %}
+<ul class="breadcrumb mb-4" itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
+	{% for parent in parents %}
+		<li class="breadcrumb-item">
+			<a href="{{ url_prefix }}{{ parent.route | abs_url }}" itemprop="url">
+			<span itemprop="title">{{ parent.title or parent.label or parent.name or "" }}</span>
+			</a>
+		</li>
+	{% endfor %}
+	<li class="breadcrumb-item active"><span itemprop="title">{{ title or "" }}</span></li>
+</ul>
+{% endif %}

foundation/templates/includes/navbar/dropdown_items.html

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+<ul class="nav-bar nav ml-auto mt-2 mt-lg-0">
+{% if top_bar_items -%}
+	{%- for page in top_bar_items -%}
+		{% if not page.parent_label and not page.right -%}
+			{% include "templates/includes/navbar/navbar_link.html" %}
+		{%- endif -%}
+	{%- endfor %}
+{%- endif %}
+{%- for page in top_bar_items -%}
+	{% if not page.parent_label and page.right -%}
+		{% include "templates/includes/navbar/navbar_link.html" %}
+	{%- endif -%}
+{%- endfor %}
+{% block navbar_right_extension %}{% endblock %}
+{% include "templates/includes/navbar/navbar_search.html" %}
+{% include "templates/includes/navbar/dropdown_login.html" %}
+</ul>

foundation/templates/includes/navbar/dropdown_login.html

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+<!-- post login tools -->
+{% if not only_static %}
+{%- for child in post_login -%}
+<li {% if child.label %}data-label="{{ child.label }}" {% endif %}
+ class="{% if child.class %} {{ child.class }} {% endif %} logged-in" >
+	{%- if child.url -%}
+	<a href="{{ child.url | abs_url }}" {{ child.target or '' }}
+	rel="nofollow">
+	{{ child.label }}
+	</a>
+	{%- endif -%}
+	</li>
+{%- endfor -%}
+{% if not hide_login %}
+<li class="btn-login-area"><a href="/login">{{ _("Login") }}</a></li>
+{% endif %}
+{% endif %}

foundation/templates/includes/navbar/navbar.html

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+<nav class="navbar navbar-expand-lg" role="navigation">
+	<a class="navbar-brand ellipsis"
+		href="{{ url_prefix }}{{ home_page or "/"}}">
+		<span>{{ brand_html or (frappe.get_hooks("brand_html") or ["Home"])[0] }}</span>
+	</a>
+	<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
+		<span class="navbar-toggler-icon"></span>
+	</button>
+	<div class="collapse navbar-collapse" id="navbarSupportedContent">
+		{% include "templates/includes/navbar/navbar_items.html" %}
+	</div>
+</nav>

foundation/templates/includes/navbar/navbar_items.html

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+{% if top_bar_items -%}
+<ul class="navbar-nav ml-auto mt-2 mt-lg-0">
+	{%- for page in top_bar_items -%}
+		{% if not page.parent_label and not page.right -%}
+			{% include "templates/includes/navbar/navbar_link.html" %}
+		{%- endif -%}
+	{%- endfor %}
+</ul>
+{%- endif %}
+<ul class="navbar-nav ml-auto mt-2 mt-lg-0">
+	{%- for page in top_bar_items -%}
+		{% if not page.parent_label and page.right -%}
+			{% include "templates/includes/navbar/navbar_link.html" %}
+		{%- endif -%}
+	{%- endfor %}
+	{% if not only_static %}
+		{% block navbar_right_extension %}{% endblock %}
+	{% endif %}
+	{% include "templates/includes/navbar/navbar_search.html" %}
+	{% include "templates/includes/navbar/navbar_login.html" %}
+</ul>

foundation/templates/includes/navbar/navbar_link.html

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+<li class="nav-item {% if page.child_items %} dropdown {% endif %}" data-label='{{ page.label }}'>
+	<a {% if not page.child_items -%} class="nav-link" href="{{ (page.url or '')|abs_url }}" {%- endif %}
+		{% if page.child_items %} class="nav-link dropdown-toggle" data-toggle="dropdown" id="navbarDropdown" role="button" aria-haspopup="true" aria-expanded="false" {% endif %}
+		{{ page.target or ''}}>
+	{{ page.label }}
+	</a>
+		<div class="dropdown-menu" role="menu">
+		{%- for child in page.child_items -%}
+			<a class="dropdown-item" data-label='{{ child.label }}' href="{{ child.url | abs_url }}" {{ child.target or '' }}>{{ child.label }}</a>
+		{%- endfor -%}
+		</div>
+	</a>
+</li>

foundation/templates/includes/navbar/navbar_login.html

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+<!-- post login tools -->
+{% if not only_static %}
+<li class="nav-item dropdown logged-in" id="website-post-login"
+	data-label="website-post-login" style="display: none">
+	<a href="#" class="nav-link dropdown-toggle" data-toggle="dropdown">
+		<span class="user-image-wrapper"></span>
+		<span class="full-name"></span>
+		<b class="caret"></b>
+	</a>
+	<div class="dropdown-menu" role="menu">
+		{%- for child in post_login -%}
+			{%- if child.url -%}
+				<a href="{{ child.url | abs_url }}" {{ child.target or '' }}
+					rel="nofollow">
+					{{ child.label }}
+				</a>
+			{%- endif -%}
+		{%- endfor -%}
+		<a href="/desk">{{ _('Switch To Desk') }}</a>
+	</div>
+</li>
+{% if not hide_login %}
+<li class="nav-item btn-login-area"><a class="nav-link" href="/login">{{ _("Login") }}</a></li>
+{% endif %}
+{% endif %}

foundation/templates/includes/navbar/navbar_search.html

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+{% if navbar_search %}
+	<li>
+		<form action='/search'>
+		<input name='q' class='form-control navbar-search' type='text'
+			value='{{ frappe.form_dict.q or ''}}'
+			{% if not frappe.form_dict.q%}placeholder="{{ _("Search...") }}"{% endif %}>
+		</form>
+	</li>
+{% endif %}