[openstreetmap/openstreetmap-website] Move continue auth/start mapping button to appear fixed to the bottom of the welcome page (PR #4947)

[Anton Khorev]

If we want something like this we can add a footer to the layout similar to `.content-heading`:

![Screen Shot 2024-07-18 at 16 52 30](https://github.com/user-attachments/assets/f84cb6ec-8ee6-4cf0-8f4d-76d5dad70f70)

![image](https://github.com/user-attachments/assets/056b4150-d3c4-4798-ae02-cf72a0c89e90)

https://github.com/AntonKhorev/openstreetmap-website/tree/x/welcome-sticky-footer

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