Add Living Scene to Widgets — weather-synced animated SVG banner, no backend or dependencies

[yuki4266]

Hi! Following the CONTRIBUTING note about discussing a change before opening a PR.

I'd like to propose adding Living Scene to the Widgets section.

It renders your profile README banner from your actual local weather. A scheduled GitHub Action asks Open-Meteo what the sky is doing at your coordinates, and redraws an animated SVG to match — six weather states, four seasons, and day/night variants that follow whichever theme the viewer has set.

A few things that I think make it a reasonable fit for the list rather than just another stats card:

• No account, no API key, no service to go down. Open-Meteo is unauthenticated, and the SVG is generated in your own repo rather than served from someone's Heroku dyno. The Outdated section here is mostly projects whose backends died — this one has no backend.
• No dependencies. One Python file, standard library only. Nothing to pip install.
• It doesn't spam your commit history. Output is deterministic per (weather, season), and the last rendered scene is recorded, so a week of clear skies produces zero commits rather than 56 identical ones.

Live example: it's running on my own profile.

Happy to open the PR in the format described in CONTRIBUTING (bottom of the Widgets list, with a preview image). Thanks for maintaining this — it's a genuinely useful list.