Update course page (#26)

* remove tagline

* update course details

* add picture of what will be built

* Update course-details.md

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

Author: brianamarie

config.yml

@@ -1,5 +1,4 @@
 title: "Communicating using Markdown"
-tagline: "Your guide to mastering Markdown"
 description: "This course will walk you through everything you need to start organizing ideas and collaborating using Markdown, a lightweight language for text formatting."
 template:
   name: "markdown-portfolio"

course-details.md

@@ -2,9 +2,29 @@ GitHub is about more than code. It’s a platform for software collaboration—a
 
 This course will walk you through creating and using headings more effectively, organizing thoughts in bulleted lists, and showing how much work you’ve completed with checklists. You can even use Markdown to add some depth to your work with the help of emoji, images, and links. See a word you don't understand? We've included an emoji 📖 next to some key terms. Click on it to see its definition.
 
+## What you'll learn
+
 In this course, you’ll learn how to:
 
 - Use Markdown to add lists, images, and links in a comment or text file
 - Determine where and how to use Markdown in a GitHub repository
 
-This course has a dedicated message board on the [GitHub Community]({{ communityBoard }}) website. If you want to discuss this course with GitHub Trainers or other participants create a post over there. The message board can also be used to troubleshoot any issue you encounter while taking this course.
+## What you'll build
+
+![screen shot of published GitHub pages site](https://user-images.githubusercontent.com/9906718/75548040-897db800-5a2c-11ea-9636-80658fa3fc7e.png)
+
+- A published GitHub Pages site showcasing different types of Markdown that you can edit and use in the future
+
+## Prerequisites
+
+In this course you will work with issues and pull requests, as well as edit files. If these things aren't familiar to you, we recommend you take the [Introduction to GitHub]({{ host }}/githubtraining/introduction-to-github) course, first!
+
+## Projects used
+
+This makes use of the following open source projects. Consider exploring these repos and maybe even making contributions!
+
+- [Jekyll](https://github.com/jekyll/jekyll): a simple, blog-aware, static site generator.
+
+## Audience
+
+Developers, GitHub users, users new to Git, students, managers, teams