posix alias and environment

The configurations should work for bash AND zsh shells.

Simply source the files in your .bashrc or .zshrc

. .shell-alias  # sets up aliases for docker, git, (eza||lsd||exa||ls), tmux autosession.. 
. .shell-env    # sets up the environment ($PATH and things like cargo, bob, go..)
. .shell-pkgmgr # sets up packagemanager commands (install, search, update...)

. .shell-proxy  # only if needed - sets up proxy with hostnamebased configurations. Add your own if needed

Thats it. done!