fix: Quoting

[hyperupcall]

Improve quoting in various areas.

I also had the chance to reproduce #242, but it seems like the issue has been fixed since then. So closes #242

[akinomyoga]

I was also searching the upstreams

• https://github.com/django/django/blob/main/extras/django_bash_completion
• [archived] https://github.com/iljaweis/vault-bash-completion
• [archived] https://github.com/kura/vagrant-bash-completion
• https://github.com/github/hub/blob/master/etc/hub.bash_completion.sh
• https://github.com/speedenator/agnoster-bash/blob/master/agnoster.bash#L40

[akinomyoga]

Updated commit messages for Conventional Commits.

[hyperupcall]

I'm not sure what other improvements I could add, but it looks good to me. It's probably not as productive to fix the completions because it is better to do so upstream - it would be nice if these sort of issues could be autofixed, but I don't think there currently exists a tool to do that (in my opinion ShellCheck doesn't do a very good job of that)