add jeffreytse/zsh-vi-mode with sheldon.
history substring search bindings are remapped to work with 'viins' and
'vicmd' (NORMAL) modes of the vi prompt, and J and K mappings in 'vicmd'
mode are added.
fzf loading also had to be reworked using system installation fzf
completions are used. bindings for fzf are broken if loaded
conventionally, therefore a helper function is offered by zsh-vi-mode to
source anything after vi mode is initialized and it is used to source
said completions.
at this occasion FZF_COMPLETION_OPTS et al. have also been reworked a
little to use dracula colorscheme, fd-find instead of find and bat to
auto-colour files.
...(https://sheldon.cli.rs/): Fast, configurable, shell plugin manager
and as a consequence of a recent(-ish) update of zsh on fedora 35
(zsh.x86_64 5.8.1-1.fc35 @updates), fpath also has to be set manually.
* necessary for the seamless use of rootless podman/podman-docker
(compat) convenience, since the "docker socket" -> podman.sock -> now
resides inside user's run directory
* follow-up of d03d466672
