Add links to concept docs to track docs. (#734)

Author: glennj

docs/SYLLABUS.md

@@ -0,0 +1,20 @@
+# Bash Concept Documents
+
+The Bash learning track is a work-in-progress.
+While the learning exercises are still incomplete, most of the concept documentation is ready to view.
+
+## Concept documents
+
+* [Commands and Arguments](https://exercism.org/tracks/bash/concepts/commands-and-arguments)
+* [Variables](https://exercism.org/tracks/bash/concepts/variables)
+* [The Importance of Quoting](https://exercism.org/tracks/bash/concepts/quoting)
+  * [Conditionals](https://exercism.org/tracks/bash/concepts/conditionals)
+    * [Arithmetic](https://exercism.org/tracks/bash/concepts/arithmetic)
+    * [Looping](https://exercism.org/tracks/bash/concepts/looping)
+  * [Arrays](https://exercism.org/tracks/bash/concepts/arrays)
+    * [More About Arrays](https://exercism.org/tracks/bash/concepts/more-arrays)
+  * [Pipelines and Command Lists](https://exercism.org/tracks/bash/concepts/pipelines)
+    * [Functions](https://exercism.org/tracks/bash/concepts/functions)
+
+There will be more.
+Check the "**What's going on with Bash**" section on the [Bash track page](https://exercism.org/tracks/bash) periodically.

docs/config.json

@@ -27,6 +27,13 @@
       "path": "docs/RESOURCES.md",
       "title": "Useful Bash resources",
       "blurb": "A collection of useful resources to help you master Bash"
+    },
+    {
+      "uuid": "82deaa52-269a-4a42-b361-136e89040fdd",
+      "slug": "syllabus",
+      "path": "docs/SYLLABUS.md",
+      "title": "Bash concept documents",
+      "blurb": "Concepts of Bash programming that will appear on the learning track"
     }
   ]
 }