Text change for data exploration

[cemac-ccs]

The text for the data exploration (per climate scenario) pages should be expended to be:

Here you can directly view how parameters such as yield and growing season duration vary with irrigation and yield gap parameter (YGP) for futures with Low Climate Risk. Zero irrigation indicates crops are purely rain-fed. Irrigation of 1 refers to fully irrigated simulations (i.e. no water stress), with intermediate values corresponding to intermediate irrigation scenarios. A yield gap parameter of 1 indicates climatic potential yields. Default yield gap parameter values are given for each crop.

[StewartJennings]

have updated text in Applications/Dashapp/layout.py