Add server dotfiles (iris, vega, nebula, nexus)

Pulled zsh/vim/bash/htop/neofetch configs into server/<host>/.
Excluded secrets (.ssh/.kube/.docker/.ansible), shell/editor caches,
and vendored upstream frameworks (oh-my-zsh, Vundle plugins) per dotfiles
best practice; reinstall steps documented in README.md.

server/vega/.zshrc

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+# If you come from bash you might have to change your $PATH.
+# export PATH=$HOME/bin:/usr/local/bin:$PATH
+
+# Path to your oh-my-zsh installation.
+export ZSH=$HOME/.oh-my-zsh
+
+# Set name of the theme to load --- if set to "random", it will
+# load a random theme each time oh-my-zsh is loaded, in which case,
+# to know which specific one was loaded, run: echo $RANDOM_THEME
+# See https://github.com/ohmyzsh/ohmyzsh/wiki/Themes
+ZSH_THEME="agnoster"
+
+
+# Uncomment the following line if you want to change the command execution time
+# stamp shown in the history command output.
+# You can set one of the optional three formats:
+# "mm/dd/yyyy"|"dd.mm.yyyy"|"yyyy-mm-dd"
+# or set a custom format using the strftime function format specifications,
+# see 'man strftime' for details.
+# HIST_STAMPS="mm/dd/yyyy"
+
+# Would you like to use another custom folder than $ZSH/custom?
+# ZSH_CUSTOM=/path/to/new-custom-folder
+
+# Which plugins would you like to load?
+# Standard plugins can be found in $ZSH/plugins/
+# Custom plugins may be added to $ZSH_CUSTOM/plugins/
+# Example format: plugins=(rails git textmate ruby lighthouse)
+# Add wisely, as too many plugins slow down shell startup.
+plugins=(git docker docker-compose zsh-autosuggestions)
+
+source $ZSH/oh-my-zsh.sh
+
+# User configuration
+
+# export MANPATH="/usr/local/man:$MANPATH"
+
+# You may need to manually set your language environment
+# export LANG=en_US.UTF-8
+
+# Preferred editor for local and remote sessions
+# if [[ -n $SSH_CONNECTION ]]; then
+#   export EDITOR='vim'
+# else
+#   export EDITOR='mvim'
+# fi
+
+# Compilation flags
+# export ARCHFLAGS="-arch x86_64"
+
+# Set personal aliases, overriding those provided by oh-my-zsh libs,
+# plugins, and themes. Aliases can be placed here, though oh-my-zsh
+# users are encouraged to define aliases within the ZSH_CUSTOM folder.
+# For a full list of active aliases, run `alias`.
+#
+# Example aliases
+# alias zshconfig="mate ~/.zshrc"
+# alias ohmyzsh="mate ~/.oh-my-zsh"