- Fixes the issue where steps altering user datapoints
- Do not altering user data points for drawing lines with steps 
(even stacked); just consider drawing with steps enables a different 
kind of plotting and clipping on lines and areas; that assuming that 
drawing with steps must always go horizontally and then verticaly 
(like previous inserted datapoints).

This allows a page to have multiple placeholders, since we're no longer
tied to unique IDs.

To improve organization with the increasing number of examples, every
example page is now the index of its own subdirectory, which contains
all the files specific to that example.