Need better documentation of all the things!

[cmdruid]

This includes better documentation for the following subjects:

• Setting up a basic environment for web development.
• Setting up a basic environment for developing core lightning plugins.
• Using the spawn command to spin up entire networks at once (similar to docker-compose)
• Using devmode to actively develop the codebase.
• Common tips and tricks for navigating and using the workbench.

Lot's of work to do!