Reformat base template

* Use <main> tag to wrap {% block main %}
* Remove trailing slash (/) in header sections

layout/_base.html

@@ -36,7 +36,7 @@
 								<div><a href="{{ '/work' | cur_lang }}" {% if work_selected %}class="selected"{% endif %}>{{ 'work' | lang }}</a></div> /
 								<div><a href="{{ '/news' | cur_lang }}" {% if news_selected %}class="selected"{% endif %}>{{ 'news' | lang }}</a></div> /
 								<div><a href="{{ '/about' | cur_lang }}" {% if about_selected %}class="selected"{% endif %}>{{ 'about' | lang }}</a></div> /
-								<div><a href="{{ '/contact' | cur_lang }}" {% if contact_selected %}class="selected"{% endif %}>{{ 'contact' | lang }}</a></div> /
+								<div><a href="{{ '/contact' | cur_lang }}" {% if contact_selected %}class="selected"{% endif %}>{{ 'contact' | lang }}</a></div>
 							</h1>
 						</div>
 						<div class="hbox">
@@ -53,12 +53,10 @@
 			</div>
 		</div>
 	</header>
-	<div id="main" class="v">
-		<div class="main-content">
-			{% block main %}
-			{% endblock %}
-		</div>
-	</div>
+	<main>
+		{% block main %}
+		{% endblock %}
+	</main>
 	<footer>
 		<h3>
 			copyright / <a href="/">www.alucho.com</a> / 2019 / <a href="/contact">{{ 'contact' | lang }}</a>