Start docs for customizing the app

(not much here yet, but will grow over time...)

docs/customize/index.rst

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+
+Customizing the App!
+====================
+
+Now that you've made it through the "setup" gauntlet, it's finally time for
+some fun stuff.
+
+As we're building this tutorial, at this point our project is *basically* the
+same as any other "Poser" project, as generated via scaffold.  But as we keep
+going, our project will become more and more customized for the purposes of the
+tutorial.
+
+So if you have just created a new project, some of this might make more sense
+to you, vs. if you're running the rattail-tutorial project itself, many things
+described in this section will have already been done (and then some) to the
+code base, so you should keep that in mind when reading.
+
+
+.. toctree::
+   :maxdepth: 2
+
+   disable-web-view