Update README.org and provide a new screenshot

Author: fritzgrabo

README.org

@@ -27,7 +27,7 @@ An SQL query that spans a JSON file and an Org table.
 
 [[screenshots/screenshot.png]]
 
-* Usage
+* Quickstart
 
 ~dsq~ source code blocks use the custom ~:input~ [[https://orgmode.org/manual/Using-Header-Arguments.html][header argument]] to specify
 one or more data sources, then run the SQL query in the source code
@@ -36,7 +36,12 @@ Org quotes, Org source blocks, etc. as data sources.
 
 The example in the above screenshot shows a ~dsq~ source block that runs a
 simple SQL query spanning a JSON file named ~people.json~ an and Org table
-named ~colors~.
+named ~foods~ in an Org file name ~random.org~.
+
+* Features, Examples
 
 See the [[examples][examples]] directory for a lot more features and customization
-options provided by Org Babel in general and ~ob-dsq~ specifically.
+options provided by Org Babel in general and ~ob-dsq~ specifically, such
+as specifying the result's type and formatting, the various options for
+passing variables into the query, querying results of an Org source
+block, and more!