docs(releaser): release v1.6.3 — logo, baseURL, gitignore fix

- Add releaser-logo-1024.png as Geekdoc site header logo (geekdocLogo)
  and a 128×128 resized copy in README
- Set docs/hugo.toml baseURL to https://releaser.k3nny.fr/
- Anchor .gitignore binary pattern to /releaser-* to stop it matching
  files inside docs/static/images/
- Restore docs URL link in README lost during merge to main

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 <img src="docs/static/images/releaser-logo-128.png" alt="releaser logo" width="128">
 
-![release](https://img.shields.io/badge/release-v1.6.2-blue.svg)
+![release](https://img.shields.io/badge/release-v1.6.3-blue.svg)
 
 A CI-friendly release automation tool for GitFlow workflows using Conventional Commits.