Week 5 coastal impact beach states

[FlorisCalkoen]

For the week 5 notebook we should probably:

• Cast the data that is used to the right format/type so that the plotting functionalities work as expected. Currently some of the data ("Omega [-]") that is used contains strings of values including greater than signs. E.g., ">5". This may result in issues when plotting the data because the pandas mask does not work on strings. Probably there is a filter somewhere like df["Omega [-]"] > 3 which doesn't work because you're comparing numbers to strings. Probably it would be better to just store data in numeric format.
• Check why we get so many warnings while plotting the data and avoid that without simply filtering them out
• Introduce the sections/questions in Markdown cells with headers.