Major doc cleanup:

- Reformat source so it's wrapped.
- Standardise markup.
- Center images.
- Restructure in various places to improve the indexing.
- Remove duplicated Query Tool toolbar descriptions.
- Ensure the structure works in both HTML and LaTeX.

docs/en_US/toolbar.rst

@@ -4,13 +4,18 @@
 `Toolbar`:index:
 ****************
 
-The pgAdmin toolbar provides shortcut buttons for frequently used features like View Data and the Query Tool
-which are most frequently used in pgAdmin.
-This toolbar is visible on the Browser panel. Buttons get enabled/disabled based on the selected browser node.
+The pgAdmin toolbar provides shortcut buttons for frequently used features like
+View Data and the Query Tool which are most frequently used in pgAdmin. This
+toolbar is visible on the Browser panel. Buttons get enabled/disabled based on
+the selected browser node.
 
 .. image:: /images/toolbar.png
     :alt: pgAdmin Toolbar
+    :align: center
 
-* Use the :ref:`Query Tool <query_tool>` button to open the Query Tool in the current database context.
-* Use the :ref:`View Data <editgrid>` button to view/edit the data stored in a selected table.
-* Use the :ref:`Filtered Rows <editgrid>` button to access the Data Filter popup to apply a filter to a set of data for viewing/editing.
+* Use the :ref:`Query Tool <query_tool>` button to open the Query Tool in the
+  current database context.
+* Use the :ref:`View Data <editgrid>` button to view/edit the data stored in a
+  selected table.
+* Use the :ref:`Filtered Rows <editgrid>` button to access the Data Filter popup
+  to apply a filter to a set of data for viewing/editing.