Add more structure for web layer docs

hopefully more content will come sooner than later..

docs/web/mainapp/dev/tasks/index.rst

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+
+Common Tasks
+============
+
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   newmasterview

docs/web/mainapp/dev/tasks/newmasterview.rst

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+
+===============
+New Master View
+===============
+
+This assumes you already have a table in your (or another) DB and wish to
+expose basic CRUD things for it, a la typical master view style.
+
+If you want to use a custom table you created, you must do that part first.
+See also :doc:`/data/db/extend`.
+
+TODO: how exactly to do it, without copy/pasta