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/iris/.zshrc

@@ -0,0 +1,11 @@
+ZSH_DISABLE_COMPFIX=true
+
+export ZSH=$HOME/.oh-my-zsh
+
+ZSH_THEME="agnoster"
+export TERM=xterm-256color
+
+plugins=(git docker docker-compose zsh-autosuggestions)
+
+source $ZSH/oh-my-zsh.sh
+