[openstreetmap/openstreetmap-website] Add devcontainer configuration (Issue #5264)

[mmd]

Thanks, this looks like a great suggestion. I gave it a try, created a new clone of the repo, then added a new devcontainer using `bundle exec rails container.`

Initially I was a bit struggling with (Debian, Rails, npm) packages on generated devcontainer. I believe we can probably reuse a lot of the existing Dockerfile and copy it over to .devcontainer/Dockerfile, thereby hopefully addressing these issues. There's a bit of overlap between the "postCreateCommand" in devcontainer.json and the existing Dockerfile, which would need to be resolved.

Then I added memcached and mailpit to compose.yaml and adjusted settings.local.yml accordingly. Both were fairly trivial to get up and running. They allow me to run more production-like scenarios without much hassle. Also, unit tests are passing successfully.

Overall I see a much improved DX compared to the old Dockerfile.

<details>
<summary>Sample screenshot</summary>

![image](https://github.com/user-attachments/assets/d5769107-8b75-4d51-b355-f095b531ad50)
</details>


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