docs: Remove outdated guide pages

[TheFactoriousDROID]

What changed and why

• Removes outdated guide pages from the English and Japanese docs navigation.
• Adds redirects from the removed pages to existing destination pages, with English redirects aligned to the Japanese redirect pattern.
• Updates legacy redirects that previously pointed at the removed "how to talk to a droid" page.

Risk / impact

Low. Docs-only removal; removed guide URLs redirect to existing pages and Cloud Templates pages are left untouched.

Testing

• Ran PR file formatting checks.
• Ran Prettier check for docs/docs.json.
• Ran Mintlify validation.
• Ran Mintlify broken-link checks with redirects enabled.

[mintlify]

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Project	Status	Preview	Updated (UTC)
factory	🟢 Ready	View Preview	May 1, 2026, 11:54 PM

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[factory-droid]

Droid finished @TheFactoriousDROID's task —— View job

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Review summary: Solid docs cleanup with nav removals and redirects for the deleted pages. The main follow-up is updating in-doc links that still point at the removed “How to Talk to a Droid” URL, since it now redirects to common-use-cases and creates confusing self-links / mislabeled CTAs.

[factory-droid]

[P1] Fix links that now self-redirect after removing “How to Talk to a Droid”

Now that /cli/getting-started/how-to-talk-to-a-droid redirects to /cli/getting-started/common-use-cases, any remaining in-doc links to the removed URL (including on common-use-cases.mdx itself) land back on the same page (or make CTAs like “How to Talk…” point somewhere unexpected); update those references (e.g. docs/*/getting-started/common-use-cases.mdx, docs/*/getting-started/video-walkthrough.mdx, docs/*/features/code-review.mdx and JP equivalents) to point directly at the intended replacement content, and remove the duplicated “For more communication tips…” line in the common-use-cases pages.