Implement Analysis on Demographics

See also hifis/survey-analysis-2020-results#3

Create the following plots:

Which center do they work for? ➡ Bar chart
What is their research area? ➡ Bar chart
What is their distribution regarding research experience and SW-development experience?
- Combining Box plots: both next to each other per center?, per field?
How much time do they spend developing software?
- Maybe per center and field as matrix plot

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