Replace LAST_UPDATED_DATE_HERE placeholders with 2026-01-16

[Copilot]

Set all date placeholders to 2026-01-16 across the support site HTML files and update README documentation.

Changes

• index.html: Updated "Last updated" dates in English (line 86) and Japanese (line 139) sections
• privacy.html: Updated "Last updated" date in header (line 22)
• terms.html: Updated "Last updated" date in header (line 20)
• README.md: Updated customization note to reflect that LAST_UPDATED_DATE_HERE is now set to 2026-01-16 (line 22)

All occurrences of the placeholder string replaced with the concrete date value.

Original prompt

Replace all LAST_UPDATED_DATE_HERE placeholders with the file creation/update date 2026-01-16 across the support site HTML and README files.

Scope:

• repo: hakaru/EtudeAnalytics-support
• files involved:
  • index.html (EN and JA sections both show "Last updated" footer text)
  • privacy.html (header "Last updated" text for EN/JA)
  • terms.html (header "Last updated" text)
  • README.md (customization section mentions placeholders)

Requirements:

• Set the date string to 2026-01-16 everywhere LAST_UPDATED_DATE_HERE appears in these files.
• In README.md, update the placeholder note so it reflects the concrete date value used.
• Keep all other content unchanged.

Notes:

• Current commit head: 437bc42
• Base branch: main
• No images provided.

Deliverables:

• Pull request with the above replacements.
• Summarize changes in PR description.

This pull request was created from Copilot chat.

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[hakaru]

反映！