Add empirical vaccination rates by age group#131

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add-empirical-vaccination-by-age-group

Commits on Sep 3, 2021

Add vaccination by age group data from RKI for 5 points in time.
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Prepare new vaccination data and extend overall vaccination share as mean of the last four weeks.
roecla
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Plot vaccination rates by age group both empirically and from our vaccination priorities.
roecla
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