Replace bootstrap with Bulma

source/_posts/2017-05-15-drupalcamp-bristol-tickets-sessions-sponsors.md

@@ -16,7 +16,9 @@ meta:
 slug: drupalcamp-bristol-early-bird-tickets-sessions-sponsors
 ---
 {% block excerpt %}
-<img src="/assets/images/blog/drupalcamp-bristol-17-logo.jpg" alt="DrupalCamp Bristol 2017 logo" class="is-centered">
+<div class="has-text-centered">
+    <img src="/assets/images/blog/drupalcamp-bristol-17-logo.jpg" alt="DrupalCamp Bristol 2017 logo">
+</div>
 
 In less than two months time, [DrupalCamp Bristol][0] will be back for our third year! (July seems to come around quicker each year). This is this year’s schedule and venues:
 

source/_posts/2017-07-13-publishing-sculpin-sites-with-github-pages.md

@@ -25,12 +25,13 @@ This made sense as I already kept the source code in [on GitHub][1], the issue w
 {% endblock %}
 
 {% block content %}
-<img
-    src="/assets/images/blog/jackson-octocat.png"
-    alt=""
-    class="is-centered"
-    style="margin-bottom: 20px"
->
+<div class="has-text-centered">
+    <img
+        src="/assets/images/blog/jackson-octocat.png"
+        alt=""
+        style="margin-bottom: 20px"
+    >
+</div>
 
 Earlier this week I moved this site from my personal Linode server to [GitHub Pages][0].