BREAKING CHANGE: For consistency, `ZSH_THEME_RANDOM_QUIET` now needs to
be `true` if you want to silence the "Random theme loaded" message in the
`random` theme.

The wiki specified that 1 or true was valid, while the code just
checked whether it was set to any value. Being more strict makes
sure that we're consistent with the rest of the Settings.

Fixes #10534

Fixes #10450

BREAKING CHANGE: the `zsh-navigation-tools` plugin now bundles the version from the
zdharma-continuum project, which republished the projects that psprint deleted (we
don't yet know yet why). In theory this change doesn't break anything, but be aware
of the change and that the upstream repository now lives somewhere else.

Source: https://github.com/zdharma-continuum/zsh-navigation-tools/commit/67b24e1

Closes #9893

Fixes #10484
Closes #10481

Fixes #10520

Closes #9396

This is an improvement (in my opinion) to the `brews` command that prints each leaf formula (in white), followed by its dependencies (in blue), on each line. Compared to the existing flat list of formulae, the new layout is both more compact and more informative, by differentiating leaves from dependencies at a glance.

Screenshot:
<img width="530" src="https://user-images.githubusercontent.com/1753319/130641713-b78535c9-e3f5-4dbb-80f8-22bc00e1129d.png">

* feat(rvm): add alias `rvms`

* docs(rvm): new alias `rvms`

* Added support for SUSE and derivatives for command-not-found plugin

* Updated command-not-found documentation to list support for SUSE and derivatives

* Add plugin for istioctl completion. close #10405

* fix typo

* Update README.md

For Volta JavaScript toolchain
https://github.com/volta-cli/volta

Closes #9463

Fixes fb86ec77

Co-authored-by: K Harishankar <48408097+Haritronic909@users.noreply.github.com>

Fixes #10505

Closes #10474
Co-authored-by: Tom Payne <twpayne@gmail.com>