rephrase personas text

[avallecam]

Suggested text:

In designing the contents of this workshop we thought about Lucia and Patricia as hypothetical candidates:
- Lucia, a Field Epidemiologist in a National Health Agency that uses R for data cleaning, plotting and automated reports. [Read more about Lucia](https://epiverse-trace.github.io/personas/lucia-outbreaks.html).
- Patricia, a PhD student learning to use R and analyse outbreak data for her research project. [Read more about Patricia](https://epiverse-trace.github.io/personas/patricia-discoverer.html).
- Vania, a Professor who needs ready-to-use teaching material for her research and to pass on to students. [Read more about Vania](https://epiverse-trace.github.io/personas/vania-academica.html).