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Includes completions for `git switch`.

An error was thrown (`bash: [: =: unary operator expected`) when using the __git_ps1_colorize_gitstring function outside of the one place it's called (line 512), because the "detached" variable was not quoted, and was unset.

There appears to be a definition issue for some functions/aliases which
result in the following errors when sourcing .zshrc:

```
/home/username/.oh-my-zsh/plugins/debian/debian.plugin.zsh:75: defining function based on alias `abd'
/home/username/.oh-my-zsh/plugins/debian/debian.plugin.zsh:75: parse error near `()'
```

Fixes #7986

The `commands[autojump]` block errs out when autojump is not found, and the rest, which is intended to be used for loading `autojump`, does not get executed.

Git learned to add a `+` in front of branches that are
checked out in other worktrees.

See: https://github.com/git/git/blob/745f6812895b31c02b29bdfe4ae8e5498f776c26/Documentation/RelNotes/2.23.0.txt#L252-L256

Removing plugin that was named after an external tool, which carries a history as a racist phrase. Was reported by a user of OMZ who shared some background on the terminology and how it made them feel. (#8027)

Redirect stderr to avoid printing errors to the console when the ssh key is not
unlocked.

Add better usage instructions for the plugin which actually work

* git: add `alias grev="git revert"`

* Swapping double for single quotes

Matching the conventions in the plugin

* Use double quotes to cache value of $apt_pref and $apt_upgr
* Clean up and fix syntax of command checks
* Clean up README and document $apt_pref/$apt_upgr overriding mechanism
* Rename `ag` alias (apt upgrade) to `au`
* Clean up README and fix syntax

Fixes #3686 
Fixes #4660 
Closes #5906
Co-authored-by: Noah Vesely <fowlslegs@riseup.net>

Zsh may be configured such that ">>" will error if the file doesn't exist (`setopt noclobber`). 

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>