FEATURE: a new beginning for nushell

[amtoine]

This PR is a quite extensive work on the nushell configuration.

I let this PR a draft for the time being and will request a review from you @atxr as soon as

• 22

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are closed :yum:

the changes

in the order of the changes as they appear in git diff bc75f53..bb466cc

• update the config.nu for version 0.70.0
• refactor all the previous script from ~/.config/nushell/scripts/ to ~/.config/nushell/lib/
  • lib/core/ contains the core modules used by nushell
  • lib/scripts/ contains all the scripts to make our lives easier
  • lib/personal/ contains the rest, namely aliases and post startup commands for now
• add the left prompt from @eldyj over on the discord server of nushell, integrates it with a switch variable in env.nu
• use path join to build all the path environment variables instead of the $"($...)" pattern
• add a bunch of new environment variables
  • GHQ_ROOT
  • QUICKEMU_HOME
  • DOTFILES_GIT_DIR
  • DOTFILES_WORKTREE
  • FZF_DEFAULT_OPTS
• simplify lib/core/keybindings.nu with only the custom and usefull bindings
• remove the br alias
• add disk and devices aliases
• split old scripts/functions.nu into
  • put all the script from the discord server inside lib/scripts/community.nu
  • create a new lib/scripts/context.nu to throw custom errors
  • put all the other scripts in lib/scripts/misc.nu
  • put some tool functions in lib/scripts/utils.nu
• add brand new modules
  • dotfiles
  • edit
  • find
  • worktree goto
  • worktree add
  • worktree remove
  • gf
  • log
  • stash
  • checkout
  • branch
  • gh
  • me notifications
  • me issues
  • me starred
  • me repos
  • me protection
  • hx
  • get info
  • get languages
  • get lsp
  • get health
  • prompt
  • fzf_ask
  • repo
  • goto
  • pull
  • remove
  • venv
  • list
  • new
  • activate
  • remove
  • vm
  • pull
  • list
  • remove
  • run