✨ [Feature request] - Cliopatria timeline slider should be marked every century

[jbennettgit]

Description of Improvement

At the moment the timeline slider at the bottom of the page changes every 69 or so years for some reason. Much more intuitive and less confusing to have the labels mark each century.

Dependencies

No response

Technical Notes

No response

Definition of Done

• The feature has been developed on a feature branch.
• The feature branch has been tested in the Staging website.
• A pull request has been created for the feature branch to be merged into the dev branch.