fix: Delete examples/example_query_and_plot.py (#133)

Delete a duplicate file. example_query_and_plot.py duplicates
example_overview_image.py.

Author: chipkent

examples/example_overview_image.py

@@ -48,7 +48,7 @@
 
 plot_prices = Figure().plot_xy("DIA", t=bars_dia, x="TimestampEnd", y="Close") \
     .x_twin() \
-    .plot_xy("SPY", t=bars_dia, x="TimestampEnd", y="Close") \
+    .plot_xy("SPY", t=bars_spy, x="TimestampEnd", y="Close") \
     .show()
 
 plot_ratio = Figure().plot_xy("Ratio", t=bars_joined, x="TimestampEnd", y="Ratio") \