suggestsed tweeks

[fhmjones]

• Make a markdown file for an introduction. It can be "trivial" for now - maybe a statement from the "readme".
• add a "Sources" section.
• the y axis should probably change to reflect selected parameter.
• Change title from "EOSC325: Storativity" to "Storativity of Aquifers"
• Change so graph starts blank, and behavior is "do nothing" until user clicks a "Show Results" button given below the Aquifer Thickness (m):" slider.
• In other words, user makes changes, then clicks "Show results" to display. This will allow instructors to set some parameters and ask students to predict result.
• Add a graph title: "Select parameters then click "Show Results" ".
• Change the text line to simply state that "Water compressibility (beta) = 4.40E-10 m^2/N." In other words, no need to display "Sa".
• First table: change "Alpha" to "Alpha (m^2/N.)"
• This may be a bit messy:
• Try a radio button to choose fixed or fitted x-axis. We want to "visualize" changes
• "fixed" implies y-max will be the largest value, and this is different for S, Ss and Sw.
• If this turns out to be really awkward we can reconsider.