Add navbar and footer doc (#329)

docs/how_to/headers_and_footers.rst

@@ -0,0 +1,19 @@
+Create header and footer overrides
+==================================
+
+You are new to CodeRedCMS/Wagtail, but you want to get up and running quickly...
+
+It isn't immediately obvious how to edit the header and a footer hasn't been created yet.
+
+A header snippet is created and inserted for you by CodeRedCMS automatically, which is a nice thing that a vanilla Wagtail installation does not have.
+
+Customizing the stock navbar can be accomplished by baked in conventional override.
+
+You will need to add a file into the **templates\coderedcms\snippets** directory. You will likely need to create the aforementioned snippets directory.
+
+Into that directory you will create a file called "navbar.html" . This file will be used instead of the navbar.html file of the CodeRedCMS pip package.
+
+It is advisable to initially use the contents of `CodeRedCMS - Master Branch - navbar.html <https://github.com/coderedcorp/coderedcms/blob/master/coderedcms/templates/coderedcms/snippets/navbar.html>`_ .
+...Advisable, but not necessary.
+
+For the footer, you can add a footer snippet via the built in GUI admin interface under **Snippets > Footer**

docs/how_to/index.rst

@@ -8,6 +8,7 @@ with CodeRed CMS.
 .. toctree::
     :maxdepth: 1
 
+    headers_and_footers
     link_targets
     translation
     docker