fix: address review issues in FrankenPHP Docker support (#8213)

[DawoudIO]

Follow-up fixes for #8213 based on code review.

Changes

• Dockerfile.churchcrm-frankenphp: Use mv instead of cp for php.ini-production — avoids leaving the unused template in the image layer, consistent with Dockerfile.churchcrm-fpm-php8
• docker/README.md: Convert setext --- heading to ATX ### style for consistency with the rest of the file
• docker/README.md: Add missing newline at end of file

Test plan

• Verify docker build -f Dockerfile.churchcrm-frankenphp --target prod . succeeds
• Confirm php.ini-production is absent and php.ini is present in the built image
• Confirm README renders correctly on GitHub

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Follow-up adjustments to the FrankenPHP Docker support added in #8213, aiming to align the Docker image layering and Docker documentation formatting with existing patterns in the repo.

Changes:

• Switch php.ini-production setup in the FrankenPHP Dockerfile from cp to mv to avoid leaving the template in the image layer.
• Update the FrankenPHP section heading in docker/README.md and ensure the file ends with a newline.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docker/README.md	Adjusts FrankenPHP section heading formatting and fixes EOF newline.
docker/Dockerfile.churchcrm-frankenphp	Uses mv for php.ini-production → php.ini to reduce leftover artifacts in the image layer.

[Copilot]

The FrankenPHP section heading was changed from a setext-style H2 to an ATX H3 ("###"), which breaks the document hierarchy: the subsequent "### Why FrankenPHP..." and "### Quick start" headings are now the same level instead of being nested under the FrankenPHP section. Consider making this heading an H2 (e.g., setext like the nginx section, or use "##") so the subheadings remain properly nested.

Suggested change

	### Self-Hosted / Production (FrankenPHP)
	## Self-Hosted / Production (FrankenPHP)