chore: update home screen architectural diagram image

[abdallahshaban557]

Description of what this PR is changing or adding, and why:

Updated image for location in Italy

Issues fixed by this PR (if any):

fixes #11615

PRs or commits this PR depends on (if any):

Presubmit checklist

• If you are unwilling, or unable, to sign the CLA, even for a tiny, one-word PR, please file an issue instead of a PR.
• If this PR is not meant to land until a future stable release, mark it as draft with an explanation.
• This PR follows the Google Developer Documentation Style Guidelines—for example, it doesn't use i.e. or e.g., and it avoids I and we (first-person pronouns).
• This PR uses semantic line breaks
  of 80 characters or fewer.

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[flutter-website-bot]

Staged preview of the updated docs.flutter.dev site (updated for commit c039ba8):

https://flutter-docs-prod--docs-pr13481-fix-issue-11615-c5axcioh.web.app

[flutter-website-bot]

Staged preview of the updated flutter.dev site (updated for commit c039ba8):

https://flutter-dev-230821--www-pr13481-fix-issue-11615-yfcxivse.web.app

[parlough]

The watermark is a bit awkward here. Rather than use Gemini to update it, @ericwindmill do you have the original setup you used to create these images?

[sfshaza2]

lgtm