Improve documentation for deployed programs

[petertonysmith94]

Summary

We have several pages of documentation for deployment of different programs:

• Contracts
• Predicates
• Scripts

It'd be worthwhile revisiting this documentation and making improvements. Possible enhancements could be some of (but not limited to) the following:

• Added the related Sway program source as an example.
• Making note of the two different deployment mechanisms (what are the differences):
  • CLI (via fuels deploy)
  • Dynamically (via ContractFactory.deploy())