fix: replace sed -i with perl -pi for macOS compatibility

[skjnldsv]

☑️ Resolves

• Fix Fix sed Command Compatibility Issue in add-lang-to-versions-template-% Target on macOS #13186

Summary

merge-folders in user_manual/Makefile used sed -i -e to rewrite
_images and _static paths in the built HTML. macOS BSD sed requires
a backup-extension argument with -i (e.g. sed -i ''), while GNU sed
does not accept an empty extension — there is no single flag spelling
that works on both.

Replace both invocations with perl -pi -e, which handles in-place
edits portably on Linux and macOS.

Before:

find ./ -type f -exec sed -i -e 's/_images/..\/_images/g' {} \;
find ./ -type f -exec sed -i -e 's/_static/..\/_static/g' {} \;

After:

find ./ -type f -exec perl -pi -e 's|_images|../_images|g' {} \;
find ./ -type f -exec perl -pi -e 's|_static|../_static|g' {} \;

Note: the add-lang-to-versions-template-% target mentioned in the
issue title was already removed in a prior refactor commit
(c40d359041). The remaining sed -i usage (in merge-folders) is
the last occurrence of this macOS-incompatible pattern.

🖼️ Screenshots

N/A — Makefile change only, no visual output affected.

✅ Checklist

• I have built the documentation locally and reviewed the output
• Screenshots are included for visual changes (N/A)
• I have not moved or renamed pages (or added a redirect if I did)
• I have run codespell or similar and addressed any spelling issues

[github-actions]

📖 Documentation Preview

🔍 Open preview →

No RST documentation pages changed in this PR.

Last updated: Thu, 21 May 2026 11:03:04 GMT