Attempt to fix three links on the Kirigami getting started page by replacing...

Attempt to fix three links on the Kirigami getting started page by replacing links that were resulting in a 404 error with a copy of link to main Kirigami API page.

Please note this is my first attempt at a merge request on GitLab. I am inexperienced in Hugo but have adjusted the erroneous links by copying an example from the same .md file that actually works.

It appears the ";subpage" part of the links I changed wasn't working, so I changed them to go to the main API page, which seems an improvement.

Of course I am open to further changes if the merge is unsuitable and would appreciate guidance with thanks!