* Generates `docs/Themes.md` that can be used
  for preview available themes

README: Include update instructions

registry: add plugin fzf

registry: add ssh-term-helper plugin

Add grc plugin

Swap `prompt_segments` and `refresh` description.

omf.bundle.install: Fix #45 by using `name_or_url` instead of `name` 

Add vundle pkg back into db.

bundle: make contents unique when adding and installing bundle

Updated cmorrell theme url

Fixes #41

completions: Use standard fish functions for completions

registry: add composer plugin

bundle: move related functions to omf.bundle namespace

Reorganize project documentation

Add apt plugin to db