Hacky layout fix for Firefox
[#74049456]

The three bar graphs would not fit themselves properly under the model in FF so width of each bar graph was
set rather than letting the layout system determine the appropriate widths.
Made several adjustments to function of charge intensity and field energy interactive
[#74321566]

- Added subtitle and about
- Modified PE calculation so all PE is positive and lowest when oppositely charged atoms are as close as they can be.
- Added text note about dragging atoms
- Adjusted aspect ratio for better layout fit
- Changed range on bar graph to accommodate new PE calculation