chore(jumbotron): disable jumbotron by default, and enable balls
Merge commit '26800c9'

This commit from 'examples_feat_shared_workspace_with_racer' branch and
by default it disables jumbotron and enables balls.
feat(jumbotron): create jumbotron based on sharedWorkspaceWithRacer

Project copied from sharedWorkspaceWithRacer to jumbotron and rename
all sharedWorkspace references to jumbotron
feat(jumbotron): remove everything that handles balls
Merge branch 'examples_feat_jumbotron'

In this branch there is jumbotron example.
Jumbotron example is based on sharedWorkspaceWithRacer example and it
has all ball handlers removed from it.