Add visuals/diagrams for if/else and loops

[smorello87]

It would help folks more inclined to learning via visual cues to understand the logics of those operations

e.g.

[kallewesterling]

Love this idea too @smorello87. We don't really have a formalized workflow for revision of workshops, but if you're up for it (and @lmrhody thinks it is a good idea), I'd say: go ahead and make the edits in a branch and open a pull request!