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

[Emin Kocan]

### Move continue auth/start mapping button to appear fixed to the bottom of the welcome page  
  
#### Objective  
To enhance the user experience by pinning the existing "Continue Auth/Start Mapping" button at the bottom of the page. This adjustment is aimed at improving user navigation and simplifying the OAuth process.  
  
<img width="1115" alt="Screenshot 2024-07-03 at 17 16 28" src="https://github.com/openstreetmap/openstreetmap-website/assets/76796906/0367b633-3727-4a02-b8a0-1ace3a3f4147">

#### Key Points  
- **Enhanced UX:** By fixing the button at the bottom, we ensure it’s always visible, making it more prominent for users during signup flow.
- **Simplified OAuth Process:** This change makes the OAuth process more intuitive and seamless, reducing potential user confusion and promoting a smoother transition.  
  

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4947

-- Commit Summary --

  * make button appear fixed on the bottom of the viewport

-- File Changes --

    M app/views/site/welcome.html.erb (18)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4947.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4947.diff

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