Change place of discussion page [WIP](#25)

Author: kawahara

_config.yml

@@ -12,5 +12,3 @@
      output: true
    news:
      output: true
-   discussion:
-     output: true

_includes/header.html

@@ -67,7 +67,6 @@ <h3 class="gnav__title text-center">DojoCon Japan 2018</h3>
         <li><a class="gnav_item" href="/news/">NEWS</a></li>
         <li><a class="gnav_item" href="/#access">ACCESS</a></li>
         <li><a class="gnav_item" href="/session/">SESSION</a></li>
-        <li><a class="gnav_item" href="/#discussion">DISCUSSION</a></li>
         <li><a class="gnav_item" href="/#sponsor">SPONSOR</a></li>
       </ul>
       <ul class="gnav__sns list-inline text-center text-md-right mb-0">

_discussion/1110_champions.md renamed to _session/1110_champions.md

@@ -14,7 +14,7 @@
           <div class="col-6 col-md-3">
             <article class="post-list__item">
               <div class="post-list__thumbnail"><a href="{{ site.url }}{{ session.url }}"><img
-                      src="/img/{{ session.thumbnail }}" alt="{{session.speaker-name}}の顔写真"></a></div>
+                      src="/img/{{ session.thumbnail }}" alt="{{session.speaker-name}}の写真"></a></div>
               <div class="post-list__content">
                 <h3 class="post-list__title">{{ session.j-title }}</h3>
                 <!--p.post-list__time-->

_discussion/1315_nonprogrammers.md renamed to _session/1315_nonprogrammers.md

@@ -129,30 +129,6 @@ <h3 class="post-list__title">{{ session.j-title }}</h3>
   </div>
 </div>
 </section>
-<section id="discussion" class="discussion bg__green">
-  <div class="container">
-    <div class="row">
-      <div class="col-12"></div>
-    </div>
-    <h2 class="heading__01">DISCUSSION</h2>
-    <div class="row post-list">
-      {% for discussion in site.discussion %}
-      <div class="col-6 col-md-3">
-        <article class="post-list__item">
-          <div class="post-list__thumbnail"><a href="{{ site.url }}{{ discussion.url }}"><img
-                  src="img/{{ discussion.thumbnail }}" alt="{{discussion.speaker-name}}の画像"></a></div>
-          <div class="post-list__content">
-            <h3 class="post-list__title">{{ discussion.j-title }}</h3>
-            <p class="post-list__speaker">{{ session.speaker-name }}</p>
-          </div>
-          <div class="post-list__more"><a class="btn btn__white btn__xl" href="{{ site.url }}{{ discussion.url }}"
-                                          role="button">more</a></div>
-        </article>
-      </div>
-      {% endfor %}
-    </div>
-  </div>
-</section>
 <section class="workshop bg__green">
 <div class="container">
   <div class="row justify-content-md-center">