Add template for `Work Achieved` slides & option to navigate back to home

Fixes #{issue_number}.

Adds a template for more slides.

And (with some difficulty) adds an option to navigate back to homepage. Not ideal place, but does the job.

Type of change

Please delete options accordingly to the description.

[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update

[ ] I have read the CONTRIBUTING docs and have a developer setup (especially important are pre-commitand pytest)
[ ] My code is properly tested
[ ] My code follows the style guidelines
[ ] My code does not contain unused elements. If so, I documented why it needs to.
[ ] My changes generate no new warnings
[ ] I have performed a self-review of my own code
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation
[ ] This pull request is ready to be reviewed
[ ] My branch is up-to-date with master (with use of rebase if needed)
[ ] If the PR is ready and there are multiple commits, I have squashed them and force-pushed