Increase depth of architecture diagrams

[mkflow27]

The architecture diagrams currently used need to be more in depth.

[EndymionJkb]

They're also from different "generations," and use different metaphors. The high-level one uses the "Tab" metaphor, while the router diagram says "lock" (from before we renamed it to "unlock"). The text is the most up-to-date, but doesn't exactly match the diagrams.

[EndymionJkb]

Here's another instance of it: https://docs-v3.balancer.fi/concepts/router/technical.html#example-transaction-flow