Add link to the persona the workshop participant is playing in each section

[technimad-splunk]

Starting at section 4 "shopping at the online boutique" explicitly mention what persona we expect the participant to play.
This helps setup the expectations and the way how you should interpret the next section.
It sets up the participant to understand WHY this section is relevant and HOW it make the work of that specific persona more efficient.

i.e.
Section 4. You are a hip urban professional, longing to buy your next novelty items in the famous hipster shop.
Section 5. You ara a frontend engineer, or an SRE tasked to do the first triage
Section 6. You are a back end engineer, or you have been called in to help investigate an issue found by the SRE.

[rcastley]