Improve user documentation

[raphCode]

This is a general tracking issue for what should be improved in the user facing documentation.

A problem is that some information is not documented at all or only at some places, because we provide multiple documentation locations:

• man page
• online docs
• zellij --help
• statusbar tips

Ideally, most / all information is available everywhere (as long as it is reasonable) because we can't expect users to check multiple places. Also, I guess most users don't expect another documentation location if they find one place.

Checklist of small documention issues I noticed:

• [ ] mention the feature to open a new tab with a predefined tab-layout in the Layouts section to help with discoverability https://github.com/zellij-org/zellij/issues/742#issuecomment-1125965282
• [x] Layout file: show how to run commands and drop into an interactive shell afterwards https://github.com/zellij-org/zellij/issues/1099 to really get an interactive shell with some commands pre-executed, it is better to use a startup script file or doing it inline in the layout config: run: command: {cmd: bash, args: ["-c", "exec bash --init-file <(echo \"set -m; source .bashrc; cd <somewhere>; vim -S\") -i"]}
• [x] https://github.com/zellij-org/zellij/issues/1377
• [ ] On the discord there was some confusion about how floating panes work

Related issues:

• https://github.com/zellij-org/zellij/issues/938
• https://github.com/zellij-org/zellij/issues/1202

[raphCode]

Maybe some basic tutorial would be helpful to lower any starting hurdles for newcomers and familiarize them with the workflows and concepts of zellij.

It could be in these forms:

• interactive tutorial in the terminal, like vimtutor
• online tutorial with commands / keystrokes to follow along
• asciinema video