zsh: delete unused code

This snippet introduced a hard-to-sopt bug, when PROMPT_SUBST is enabled.
Sometimes the characters were not escaped correctly, and so they were printed on
the terminal instead of being hidden.
zsh: add ruby19 programs to PATH
dircolors: add more file types
colors: move a line
slate: better shortcuts
zsh: fix typo
zsh: add more aliases
zsh: remove unused aliases

add themes dir to colout
zsh: add bindings for vicmd mode
Add new function to get port checksums
Add some tex snippets
vim: fix port snippet indents
zsh: delete zsh-completions, now using port
vim: some new useful mappings for latex
zsh: use single quotes when possible
zsh: use dollars only when necessary
zsh: add vim mode indicator
zsh: add useful module, fix highlight
vim: plugins

Remove unused plugins, add new ones with their configuration.
vim: add fold markers, reorder some settings