add heroku stub page

mattmakai · mattmakai · commit 6af3add21603 · 2018-12-30T11:13:16.000-05:00
diff --git a/content/pages/03-data/13-apache-cassandra.markdown b/content/pages/03-data/13-apache-cassandra.markdown
@@ -114,8 +114,10 @@ resulting tools as open source projects.
   compares Cassandra to traditional [relational databases](/databases.html).
 
 * [On Cassandra Collections, Updates, and Tombstones](https://www.sestevez.com/on-cassandra-collections-updates-and-tombstones/)
-  presents a mistake of using collections in the wrong way that developers 
-  often make when using Cassandra for the first time.
+  and
+  [Undetectable tombstones in Apache Cassandra](http://thelastpickle.com/blog/2018/07/05/undetectable-tombstones-in-apache-cassandra.html)
+  present how developers often use Cassandra collections incorrectly
+  when they are not experienced with how the data store operates. 
 
 * [When to use Cassandra and when to steer clear](https://towardsdatascience.com/when-to-use-cassandra-and-when-to-steer-clear-72b7f2cede76)
   explains the advantages Cassandra provides such as high throughput on
@@ -132,4 +134,12 @@ resulting tools as open source projects.
   are good technical posts on the data structures within Cassandra's
   architecture along with some of the problems that can pop up when
   working with your data.
-  
+
+* [Analyzing Cassandra Performance with Flame Graphs](http://thelastpickle.com/blog/2018/01/16/cassandra-flame-graphs.html)
+  and
+  [Garbage Collection Tuning for Apache Cassandra](http://thelastpickle.com/blog/2018/04/11/gc-tuning.html)
+  are two posts in a series on how to debug issues in operational 
+  Cassandra deployments using appropriate data visualization, especially
+  when the issue is due to the Java Virtual Machine (JVM)'s garbage 
+  collection methods.
+
diff --git a/content/pages/05-deployment/10-heroku.markdown b/content/pages/05-deployment/10-heroku.markdown
@@ -0,0 +1,27 @@
+title: Heroku
+category: page
+slug: heroku
+sortorder: 0510
+toc: False
+sidebartitle: Heroku
+meta: Heroku is an implementation of the platform-as-a-service (PaaS) concept that can be used to more easily deploy Python applications.
+
+
+# Heroku
+<a href="https://www.heroku.com/">Heroku</a> is an implementation of 
+the platform-as-a-service (PaaS) concept that can be used to more 
+easily [deploy](/deployment.html) Python applications.
+
+<a href="https://www.heroku.com/" style="border:none"><img src="/img/logos/heroku.png" width="100%" alt="Heroku logo." class="shot outl rnd"></a>
+
+
+### Heroku resources
+* [Migrating your Django Project to Heroku](https://realpython.com/migrating-your-django-project-to-heroku/)
+  is a full tutorial on using Heroku to run [Django](/django.html) web
+  applications. It includes instructions on converting from 
+  [MySQL](/mysql.html) to [PostgreSQL](/postgresql.html) if necessary 
+  as well as how to properly handle your settings files.
+
+* Heroku's 
+  [official Python documentation](https://devcenter.heroku.com/articles/getting-started-with-python) 
+  is fantastic and walks through deploying WSGI applications in short order.
diff --git a/content/pages/05-deployment/14-ubuntu.markdown b/content/pages/05-deployment/14-ubuntu.markdown
@@ -13,7 +13,7 @@ meta: Ubuntu is a Debian Linux-based operating system distribution often used fo
 [Python development](/learning-programming.html) and 
 [web application deployment](/deployment.html).
 
-<a href="https://www.ubuntu.com/" style="border: none;"><img src="/img/logos/ubuntu-linux.png" width="100%" alt="Official Ubuntu logo. Copyright Canonical Ltd." class="shot rnd"></a>
+<a href="https://www.ubuntu.com/" style="border: none;"><img src="/img/logos/ubuntu-linux.png" width="100%" alt="Official Ubuntu logo. Copyright Canonical Ltd." class="shot"></a>
 
 
 ## Why is Ubuntu important for Python?
diff --git a/static/img/logos/heroku.png b/static/img/logos/heroku.png
diff --git a/theme/templates/choices/heroku.html b/theme/templates/choices/heroku.html
@@ -0,0 +1,18 @@
+<h3>What else do you want to learn about deployment?</h3>
+<div class="row">
+ <div class="c4">
+  <div class="well select-next">
+   {% include "choices/buttons/operating-systems.html" %}
+  </div>
+ </div>
+ <div class="c4">
+  <div class="well select-next">
+   {% include "choices/buttons/platform-as-a-service.html" %}
+  </div>
+ </div>
+ <div class="c4">
+  <div class="well select-next">
+   {% include "choices/buttons/databases.html" %}
+  </div>
+ </div>
+</div>
diff --git a/theme/templates/table-of-contents.html b/theme/templates/table-of-contents.html
@@ -156,7 +156,7 @@ <h4>5.2 <a href="/virtual-private-servers-vps.html">Virtual Private Servers (VPS
 <div class="tc sn">Digital Ocean</div>
 <div class="tc sn">Lightsail</div>
 <h4>5.3 <a href="/platform-as-a-service.html">Platform-as-a-Service</a></h4>
-<div class="tc sn">Heroku</div>
+<div class="tc"><a href="/heroku.html">Heroku</a></div>
 <div class="tc sn">PythonAnywhere</div>
 <div class="tc sn">Codestar</div>
 <h4>5.4 <a href="/operating-systems.html">Operating systems</a></h4>
