Add list of buttons blog post

docs/_posts/2017-10-22-list-of-buttons.md

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+---
+layout: post
+title: "New feature: list of buttons"
+introduction: "What's better than one button? Multiple buttons!"
+color: "danger"
+name: "List of buttons"
+icon: "button"
+---
+
+Similarly to the [list of tags](/2017/08/03/list-of-tags/) launched a few months ago, the [button](/documentation/elements/button/) has its own **list of buttons**:
+
+<figure>
+  <a href="/documentation/elements/button/#list-of-buttons">
+    <img src="/images/blog/list-of-buttons.png" alt="List of buttons in CSS" width="660" height="550">
+  </a>
+</figure>
+
+Although you could already **group** buttons by using [from groups](/documentation/form/general/#form-group), this new `buttons` class makes everything easier.

docs/_posts/2017-11-01-fixed-navbar.md

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+---
+layout: post
+title: "New feature: fixed navbar"
+introduction: "Fix your navbar at the top or bottom"
+color: "info"
+name: "Fixed navbar"
+icon: "fix"
+published: true
+---