Rework the timelines

[maciejjan]

• add timeline for Octavo query
• different ways of plotting (line / points with moving average)
• different lines on one plot
• option to set the size of the labels
• option to set the scale (ylim) manually

[maciejjan]

TODO:

• timeline for parish: choose multiple parishes, curves of different colors
• timeline for Octavo query
• moving averages instead of aggregating by decade
• model on Elore article (Fig. 11 and 12)