[DOCS] Split Node Config Page

[cpengilly]

Brief Description of the Docs Request

We'd like to clean up the node configuration page. With so much scrolling on this page it becomes a usability concern.

Description of the Documentation You'd Like

split node config page into op-node and op-geth and maybe an overview page for how they work together:

• overview with just the top section and links to the other two pages
• op-geth (minimal base config + all config options)
• op-node (minimal base config + all config options)

[cpengilly]

suggestion: I wouldn't keep an node config overview page at all. I'd take the node config overview section and relocate to the general node overview page, linking from there to the new op-node config and op-geth config pages 😄
cc @sbvegan