Recommend using latest cabal-install

- Shorten the suggestion to use cabal.release.project
- Move up cabal.release.project for initial build
- Put the --project-file option after as suggested by the command help
- Usage: cabal build [TARGETS] [FLAGS]
- Use the latest markup for note
- $ prefix for command line

(cherry picked from commit de89ffe7)

# Conflicts:
#	CONTRIBUTING.md