docs: rework project network script documentation

[s3bc40]

This pull request primarily updates the documentation for the Moccasin project, introducing clarifications, new examples, and additional references. The most significant changes include adjustments to project structure descriptions, updates to configuration options, and improvements in code examples.

Updates to project structure and configuration:

• Added a new lib/ directory to the example Moccasin project structure and described its purpose for storing Moccasin dependencies. (docs/source/core_concepts/project.rst, [1] [2]
• Included instructions on customizing the locations of scripts, compiler output, and libraries in the moccasin.toml file, with a reference to the full list of configuration options. (docs/source/core_concepts/project.rst, docs/source/core_concepts/project.rstR37-R40)

Improvements to code examples:

• Updated the Vyper compiler pragma example to use >=0.4.1 instead of ^0.4.1 and added a link to additional Vyper compiler options. (docs/source/core_concepts/project.rst, docs/source/core_concepts/project.rstL43-R54)
• Fixed a typo in the force_deploy option description for named contracts. (docs/source/core_concepts/named_contracts.rst, docs/source/core_concepts/named_contracts.rstL97-R97)

Additional references:

• Added an explanation of how contracts are imported as Titanoboa VyperDeployer and VyperContract instances, with links to the relevant Titanoboa documentation. (docs/source/core_concepts/script.rst, docs/source/core_concepts/script.rstR90-R91)

Minor updates:

• Changed the is_zksync default value from true to false in the fork_defaults.rst documentation. (docs/source/_autogenerated/fork_defaults.rst, docs/source/_autogenerated/fork_defaults.rstL1-R1)