ITSI: Fix Ammonia Molecules

By using valence electrons of 3, we can get the H atoms evenly spaced
around the N atom.
ITSI: Heat and Temperature 1 interactive
ITSI: Constructing Water Molecules interactive

[#61768524]
ITSI: Constructing Larger Water interactive

[#61768676]
ITSI: Heat & Temp 2: Shorten option text

[#61767464]
Add support for adding bonds through scripts
ITSI: Correct Ratio of Hydrogen and Oxygen interactive

[#61768806]
ITSI: Clean up unneeded models/interactives