Replace vaxis with zterm (#1)

Vaxis sadly cannot be used for applications which want to serve their contents via ssh to the (remote) user.

Instead I wrote my own tui library [zterm](https://gitea.yves-biener.de/yves-biener/zterm), which this tui application now uses. This will serve two purposes:
1. implement the tui application and be servable through ssh (see [wish-serve](https://gitea.yves-biener.de/yves-biener/wish-serve))
2. serve as documentation and showcase of an example application for **zterm**

Reviewed-on: #1

README.md

@@ -4,12 +4,14 @@ This is my terminal based website. It is served as a tui application via ssh and
 
 It contains information about me and my projects as well as blog entries about something I feel like writing something about.
 
+## zterm
+
+This tui application also serves as an example implementation of the [zterm](https://gitea.yves-biener.de/yves-biener/zterm) library.
+
+---
+
 ## 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`)
 - [ ] Improve navigation
 - [ ] Have clickable/navigatable links inside of the tui application
 - [ ] Launch simple http server alongside tui application