Add blog and changelog categories

docs/_posts/2017-02-11-use-vim-as-a-java-ide.md

@@ -1,3 +1,7 @@
+---
+categories: blog
+---
+
 # [Blogs](https://spacevim.org/community#blogs) > Use Vim as a Java IDE
 
 I am a vimmer and a java developer. Here are some useful plugins for developing java in vim/neovim.

docs/community.md

@@ -24,8 +24,10 @@ To report an issue or give feedback to the developers, please use the [issue tra
 
 <ul>
     {% for post in site.posts %}
+        {% if post.categories == "blog" %}
             <li>
                 <a href="{{ post.url }}">{{ post.title }}</a>
             </li>
+        {% endif %}
     {% endfor %}
 </ul>

docs/development.md

@@ -32,3 +32,15 @@ endfunction
 ```
 
 4. send PR to SpaceVim.
+
+## Changelog
+
+<ul>
+    {% for post in site.posts %}
+        {% if post.categories == "changelog" %}
+            <li>
+                <a href="{{ post.url }}">{{ post.title }}</a>
+            </li>
+        {% endif %}
+    {% endfor %}
+</ul>