Update pages config only when changed

What does this MR do?

This does a small performance improvement:

1. Currently, each update of pages forces daemon to reload,
2. We need to reload pages only when configuration does change, not content,
3. When content does change it will be automatically be picked by pages.

What are the relevant issue numbers?

None yet.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer