[tui] Update tui docs (README and lib.rs) for the new remove redux architecture

[nazmulidris]

Update these to reflect the new changes in architecture (after dropping redux)

1. https://github.com/r3bl-org/r3bl-open-core/blob/main/tui/README.md
2. https://github.com/r3bl-org/r3bl-open-core/blob/main/README.md
3. https://github.com/r3bl-org/r3bl-open-core/blob/main/tui/src/lib.rs

Design doc: https://docs.google.com/document/d/1OMB1rX6cUL_Jxpl-OUWMhJijM7c4FoDrK6qDViVXBWk/edit

Migrate all the diagrams to https://asciiflow.com/#/ from figma. And include them inilne w/ the MD or lib.rs