docs: restructure help pages into bundles and add new reference pages

Convert several pages to leaf bundles with WebP screenshots, add
api-keys, domain-availability, notifications, provider-features,
quotas, services, settings, signup and subdomains pages, and refresh
existing content.
This commit is contained in:
nemunaire 2026-06-11 16:50:06 +09:00
commit c372f8409a
81 changed files with 1957 additions and 155 deletions

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