docs: manual

[ss-o]

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines.

Description

The manual page is outdated and has been added to the TODO list.

https://github.com/z-shell/zi/blob/5286a4adf4a119f5e57e65af1146a57bbbf91624/docs/man/zi.1

Self-service

• I'd be willing to address this documentation request myself.

[create-issue-branch]

Branch issue-90-docs_manual created!

[github-actions]

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