Improve stack running documentation

[thedarkjester]

Description

Improve developer documentation for running various parts of the stack independently.

Note: some of the tasks required does have existing documentation, but there is a need to make it more navigable.

Motivation

There is a wide range of developers would like to test different aspects of the stack locally vs. on Sepolia testnet and it is beneficial for them to do so with the current stack's EVM version and framework.

Tasks

Add documentation for:

• Running the L2 stack only
• Running the L1->L2 messaging stack
• Running the full stack with L2->L1 message (with an integration test verifier)
• Running the full stack with real provers
• Discuss with the content team how this can be exposed on the main documentation site

Acceptance criteria

• Documentation is easy to read and covers all areas described

Remember to

• Add the documentation label in case there is an impact on the documentation
• Add priority and team labels