Add pdf logo

	new file:   docs/_static/pdf-logo.png
	modified:   mkdocs-base.yml

Author: alina-derkach-oaza

docs/_static/pdf-logo.png

@@ -127,7 +127,7 @@ plugins:
           cover_title: 'Percona Server Documentation'
           cover_subtitle: 8.4.0-1 (2024-0-)
           author: 'Percona Technical Documentation Team'
-          cover_logo: docs/_static/Percona_Logo_Color.png
+          cover_logo: docs/_static/pdf-logo.png
           debug_html: false
           custom_template_path: _resource/templates
           enabled_if_env: ENABLE_PDF_EXPORT