fix: update logo URLs to /brand/ path

[moss-bryophyta]

Updates README logo URLs from generaltranslation.com/gt-logo-*.svg to generaltranslation.com/brand/gt-logo-*.svg.

Also fixes the <picture> tag logic so the light logo shows in light mode and dark logo is the default.

Greptile Summary

This PR makes two small, low-risk changes to README.md: it updates the logo image URLs from the root path (/gt-logo-*.svg) to the /brand/ subdirectory (/brand/gt-logo-*.svg), and it inverts the <picture> element's theme-switching logic so the dark logo is the <img> fallback (shown by default and in dark mode) while the light logo is served explicitly only when the user's color scheme is light.

Key changes:

• Logo URL paths updated: /gt-logo-*.svg → /brand/gt-logo-*.svg
• <source> media query changed from (prefers-color-scheme: dark) → (prefers-color-scheme: light)
• <img> fallback changed from the light logo to the dark logo — meaning users with no color-scheme preference will now see the dark logo instead of the light one

Minor note: The PR description frames the logic change as a "fix", but the original code was not broken — both approaches are valid. The behavioral difference is only for users who have not set a color-scheme preference: previously they would see the light logo; now they will see the dark logo. This is a deliberate design decision and appears intentional.

Confidence Score: 5/5

• This PR is safe to merge — it only modifies README.md with a URL path update and a deliberate inversion of the logo theme-selection fallback.
• Only README.md is changed; no production code, logic, or configuration is affected. The URL and HTML changes are straightforward and low-risk.
• No files require special attention.

Important Files Changed

Filename	Overview
README.md	Updates logo URLs to /brand/ path and inverts <picture> element logic so the dark logo is the default fallback and the light logo is served only when light mode is detected.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Browser loads README] --> B{Supports prefers-color-scheme?}
    B -- No --> D[Render fallback img\ngt-logo-dark.svg]
    B -- Yes --> C{Color scheme preference?}
    C -- light --> E[Render source\ngt-logo-light.svg]
    C -- dark --> D
    C -- no preference --> D

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