vim/tmux: Inline tmux-vim-select-pane into tmux config
vim: Add some generally useful settings from tpope's vimrc
vim: Remove ack.vim, not used anymore
vim: Fix delay when switching modes in the terminal
vim: Add plugins: elixir, ragtag, rsi
shell: Skip entering tmux by setting SKIP_TMUX=1
shell: Update oh-my-zsh