[DOCS] Add information about running bootnodes

[sbvegan]

Brief Description of the Docs Request

Chain operators should have information on how to properly run a bootnode.

Description of the Documentation You'd Like

• Overview of boot nodes
• op-node bootnode
• op-geth bootnode
• use the one from the monorepo or from upstream geth?

Links to Related Pages

• https://docs.optimism.io/builders/chain-operators/architecture
• new page under BUILDERS > Chain Operators > Chain Management ?

Additional Context

Provide any additional context about this documentation request. What problems did you run into that caused you to make this request? Which existing documentation pages did you already try as a solution to your problem? Why do you think the requested page(s) will be beneficial to developers in the Optimism Collective?