Small Update to Docs

[confused-Techie]

This PR started out of the need/want to create a flow chart of the logic of Pulsar as a whole, to remove the need to go trawling through the source code to find who initializes what, when. While the included documents don't totally solve this problem, in my opinion it does help considerable.

I've added two new documents here:

• overview: Covers the starting up of Pulsar, as well as what important variables are being set where
• the-world: Covers which modules initialize other modules during startup of 'The World' (AtomEnvironment). Helping to keep the full structure within Pulsar, easily and readily available.

The tools to create these charts are open source, freely available, and have online editors, ensuring anyone on the team is easily able to update them as needed.

Lastly, within the ./docs/README.md I noticed most of the links were totally broken after the sunset, so those have been updated, as well as adding links to the new documents I've added.

I know the written content isn't perfect, but really my goal was to include the charts, and some other slightly helpful info.

[confused-Techie]

With how helpful these docs are, and how often I reference them, and without any reviews stating otherwise I'll go ahead and merge this one.