[DOCS] Phase 1 updates

[stufraser1]

• Note that phase 1 is done in Loss Simulator
• Shorten key decision-making considerations - key Qs only

[stufraser1]

Step 2 cites at the beginning: "This step uses the online Loss Simulator <https://idf-rmsg.shinyapps.io/DisasterRiskPooling>_."
I think this is the appropriate place for it, as the preceding step is more general.

[stufraser1]

Adjusted logn key decision making Qs - put one into its own fundamental principle - on how reliable the historical data is.