add/mod the following features

- split structure for better inclusions
- create PlainRenderer to render contents to the terminal
- simplify events
- clearify what structs are created on the heap and which are on the stack
- quit event is now emitted from the main event loop and not the input loop (see helper function `App.quit`)
- rename several variables and/or functions for easier understanding
- introduce `App.interrupt` to stop the input thread and start a new sub TUI which takes over the entire screen (i.e. 'hx', 'nvim', etc.)

README.md

@@ -6,11 +6,6 @@ It contains information about me and my projects as well as blog entries about s
 
 ## Open tasks
 
-- [ ] BUG: when served via `wish-serve` the corresponding outputs are not pushed through the ssh connection
- - they are instead showed locally, which might cause issues with the docker container running in the background
- - very likely it is `tui-website` which causes this issue
- - not entirely as inputs are not passed through correctly to the below running application (i.e. `diffnav` via `serve git diff`)
- - fex however works as expected
 - [ ] Improve navigation
 - [ ] Have clickable/navigatable links inside of the tui application
 - [ ] Launch simple http server alongside tui application
@@ -20,3 +15,4 @@ It contains information about me and my projects as well as blog entries about s
 ## Branch: `own-tty-visuals`
 
 - [ ] How can I support to run a sub-process inside of a given pane / layout?
+- [ ] Create demo gifs using [vhs](https://github.com/charmbracelet/vhs)