docs: add brand logos

[Copilot]

Hides the branding assets directory by renaming brand/ → .brand/ and updates all references accordingly.

Changes

• git mv brand .brand — all five assets relocated
• README.md — srcset/src paths updated to .brand/…
• .brand/README.md — usage example snippet updated to .brand/…

Original prompt

Create a PR in tschaefer/finch to add GitHub-focused branding assets derived from the provided finch.svg and update the repository README to display the logo.

Requirements:

1. Add a brand/ directory containing at least:
   • brand/finch-logo-horizontal.svg (light mode)
   • brand/finch-logo-horizontal-dark.svg (dark mode; suitable for GitHub dark theme)
   • brand/finch-icon-circle.svg (mark inside a circle)
   • brand/finch-icon-circle-dark.svg
   • Optional but nice: brand/README.md describing usage and colors.
2. The assets must be based on the user-provided SVG content (attached in the chat) and preserve the existing wordmark style. For the circle icon, wrap the existing mark in a circular container and ensure it is visually centered with adequate padding.
3. Update README.md to show the horizontal logo at the top using a <picture> element switching between light/dark variants (prefers-color-scheme). Alt text should use corrected tagline: "Finch - The Minimal Observability Infrastructure".
4. Fix any instances of the typo "Observabilty" to "Observability" in README-facing text introduced/edited by this PR (do not change historical blog link URLs).
5. Ensure relative paths work on GitHub.

Source SVG provided by user (use as basis):

<svg width="323.28785046480954" height="261.35625" viewBox="0 0 250 202.10800500562664" class="looka-1j8o68f"><defs id="SvgjsDefs1105"></defs><g id="SvgjsG1106" featurekey="JiLV9t-0" transform="matrix(1.25,0,0,1.25,62.50000834465027,-14.999923706054688)" fill="#20415a"><g xmlns="http://www.w3.org/2000/svg" transform="translate(0,-952.36218)"><path d="m 60.7828,964.36215 27.1809,0.8834 -27.1809,25.9958 z m -1.9745,1.4513 0,26.7845 -25.2681,0 c 8.6166,-8.7334 16.8796,-17.8103 25.2681,-26.7845 z m 27.7053,3.628 3.4864,1.1989 -12.5877,7.4768 z m -68.1835,2.9656 5.5226,0 12.8654,14.0705 -5.9854,6.1204 -12.4026,0 c 9e-4,-6.7347 0,-13.4597 0,-20.1909 z m -1.9746,1.2304 0,5.8364 -6.3555,0 z m 3.363,20.9796 38.627,0 -10.7675,29.43465 z m 39.0898,4.54286 0,41.20229 -12.5878,-6.8775 c 4.1972,-11.443 8.3886,-22.879 12.5878,-34.32479 z" style="text-indent: 0; text-transform: none; direction: ltr; block-progression: tb; baseline-shift: baseline; color: ; enable-background: accumulate" fill="#20415a" fill-opacity="1" stroke="none" marker="none" visibility="visible" display="inline" overflow="visible"></path></g></g><g id="SvgjsG1107" featurekey="Yxc9Rz-0" transform="matrix(6.2220003575447596,0,0,6.2220003575447596,-4.977599989347711,77.66800082161241)" fill="#20415a"><path d="M0.8 20 l0 -14 l2.52 0 l0 14 l-2.52 0 z M4.16 14.26 l0 -2.52 l2.38 0 l0 2.52 l-2.38 0 z M4.16 8.52 l0 -2.52 l3.5 0 l0 2.52 l-3.5 0 z M9.26 12.58 l0 -6.58 l2.52 0 l0 6.58 l-2.52 0 z M9.26 20 l0 -6.58 l2.52 0 l0 6.58 l-2.52 0 z M18.86 20 l-5.48 -14 l2.72 0 l2.92 7.48 l0 -7.48 l2.52 0 l0 14 l-2.68 0 z M13.42 20 l0 -11.6 l2.52 6.42 l0 5.18 l-2.52 0 z M25 20 l-1.86 -1.86 l0 -10.28 l1.86 -1.86 l1.78 0 l0 2.52 l-0.74 0 l-0.38 0.38 l0 8.2 l0.38 0.38 l0.74 0 l0 2.52 l-1.78 0 z M27.62 20 l0 -2.52 l0.74 0 l0.38 -0.38 l0 -1.58 l2.52 0 l0 2.62 l-1.86 1.86 l-1.78 0 z M28.74 10.48 l0 -1.58 l-0.38 -0.38 l-0.74 0 l0 -2.52 l1.78 0 l1.86 1.86 l0 2.62 l-2.52 0 z M36.22 14.26 l0 -2.52 l2.24 0 l0 -5.74 l2.52 0 l0 8.26 l-4.76 0 z M32.86 20 l0 -14 l2.52 0 l0 14 l-2.52 0 z M38.46 20 l0 -4.9 l2.52 0 l0 4.9 l-2.52 0 z"></path></g></svg>

Acceptance checks:

• README renders a logo at top on GitHub and switches correctly in dark mode.
• New brand/ assets exist and are referenced with relative paths.
• No misspelling "Observabilty" remains in modified README text.

This pull request was created from Copilot chat.

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