filtering demo not working

need clearer example of filtering demo, the current demo does not work for me,
append gives error on this line
grid.behavior.dataModel.append(require('datasaur-filter'));

Start by locating the filtering demo and reproduce the error on the line `grid.behavior.dataModel.append(require('datasaur-filter'));`. Determine what the demo currently needs to show and update the example so filtering works and its usage is clear.

Written by the indexing model from the issue text.