Fix incorrect html tag endings + Put every headline into its own if check

.gitignore

@@ -1,2 +1,3 @@
 venv/
 .DS_Store
+.idea/

templates/layout-2020.html

@@ -78,14 +78,14 @@
             <a class="nav-link" href="/u/offers/">OFFERS</a>
           </li>
           <li class="nav-item">
-            <a class="nav-link" href="/blog/">OLD BLOG<a/>
+            <a class="nav-link" href="/blog/">OLD BLOG</a>
           </li>
           <li class="nav-item">
-            <a class="nav-link" href="/u/blog/">BLOG<a/>
+            <a class="nav-link" href="/u/blog/">BLOG</a>
           </li>
           <li class="nav-item">
             <a class="nav-link" href="/u/projects/open-chat/">CHAT
-            WITH US<a/>
+              WITH US</a>
           </li>
           <li class="nav-item">
             <a class="nav-link" href="/u/events/">EVENTS</a>
@@ -99,18 +99,28 @@
         </form>
       </div>
     </nav>
-    {% if this.headline1 %}
+    {% if this.headline1 or this.headline2 or this.headline3 %}
     <div class="jumbotron jumbotron-fluid" style="background-color: {{this.header_background_color}};">
       <div class="container-fluid">
-          <h1 class="display-1 generic-header {{this.header_text_color}}" style="font-weight: bolder;">{{this.headline1}}</h1>
-          <h1 class="display-1 generic-header {{this.header_text_color}}" style="font-weight: bolder;">{{this.headline2}}</h1>
-          <h1 class="display-1 generic-header {{this.header_text_color}}" style="font-weight: bolder;">{{this.headline3}}</h1>
+          <h1 class="display-1 generic-header {{this.header_text_color}}" style="font-weight: bolder;">
+            {% if this.headline1 %}
+            {{this.headline1}}
+            {% endif %}
+
+            {% if this.headline2 %}
+            <br/>{{this.headline2}}
+            {% endif %}
+
+            {% if this.headline3 %}
+            <br/>{{this.headline3}}
+            {% endif %}
+          </h1>
       </div>
     </div>
     {% else %}
     <div class="position-relative overflow-hidden p-3 p-md-5 m-md-3 text-center bg-light">
       <div class="col-md-5 p-lg-5 mx-auto my-5">
-        <h1 class="display-4 font-weight-normal">{{ self.title() }}
+        <h1 class="display-4 font-weight-normal">{{ self.title() }}</h1>
         <p class="lead font-weight-normal">
           {% block subtitle %}{% endblock %}
         </p>