doc: Update documents. (#37)

[MinoruSekine]

Closes #37

Summary by CodeRabbit

• Documentation
  • Updated the CLI options guide to use capitalized option names consistently.
  • Added documentation for optional title and detail fields.
  • Documented support for button links via URL-based options.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@README.md`:
- Around line 30-31: Clarify the `-Link` and `-Url` option descriptions in the
README so they reflect the actual contract in the toast notification flow: each
flag is only optional as part of the pair, and both are required together when
enabling the link button. Update the wording near the `-Link`/`-Url` entries to
make this dependency explicit, matching the behavior enforced by the
implementation.

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📥 Commits

Reviewing files that changed from the base of the PR and between 5e4924e and 4c72ffc.

📒 Files selected for processing (1)

• README.md