docs(web): document /commit command workflow

[Frexxis]

What

• Document a copy/paste custom command (/commit) that generates a commit subject from git diffs/status.
• Default behavior runs git commit -m \"...\" using staged changes; supports --dry (message only) and --ask (prompt before committing).

Why

• Gives new users a safe, repeatable commit flow without adding opinionated built-in behavior.

How

• Add a new section to the Commands docs with an example .opencode/commands/commit.md.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[Copilot]

Pull request overview

This PR adds documentation for a custom command example that generates git commit messages using shell output placeholders. The example demonstrates how to use git commands (git diff, git diff --cached, git status --short) within a command template to create a repeatable commit-message workflow.

Changes:

• Added a new "Generate a commit message" section with a complete, copy-paste ready command example

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[Frexxis]

Copilot suggestion applied: the section is now a heading to preserve the doc hierarchy.

[github-actions]

Closing this pull request because it has had no updates for more than 60 days. If you plan to continue working on it, feel free to reopen or open a new PR.