Use bundled SVG for the logo instead of a Wikimedia hotlink

The README and docs landing-page logo were hotlinked from
upload.wikimedia.org at a 220px thumbnail width. Wikimedia now rejects
hotlinked thumbnails at non-standard widths with HTTP 400, and 220px is not
on the permitted list (20, 40, 60, 120, 250, 330, 500, 960, 1280, 1920,
3840), so the logo no longer renders.

The same artwork is already bundled at docs/Chameleon.svg, so both <img>
tags now point at the local file. width='220' keeps the previous size; the
SVG's intrinsic width is ~170px.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: malberts

README.md

@@ -4,7 +4,7 @@
 [![Latest Stable Version](https://poser.pugx.org/mediawiki/chameleon-skin/v/stable)](https://packagist.org/packages/mediawiki/chameleon-skin)
 [![Packagist download count](https://poser.pugx.org/mediawiki/chameleon-skin/downloads)](https://packagist.org/packages/mediawiki/chameleon-skin)
 
-<img src='https://upload.wikimedia.org/wikipedia/mediawiki/thumb/3/31/Chameleon.svg/220px-Chameleon.svg.png' style='float:left;' align="left" title='Chameleon Skin Logo'>
+<img src='docs/Chameleon.svg' width='220' style='float:left;' align="left" title='Chameleon Skin Logo'>
 
 Chameleon is a highly customizable [MediaWiki][mw] skin that uses the
 [Bootstrap][twbs] framework.

docs/index.md

@@ -1,6 +1,6 @@
 # The Chameleon Documentation
 
-<img src='https://upload.wikimedia.org/wikipedia/mediawiki/thumb/3/31/Chameleon.svg/220px-Chameleon.svg.png' align='left' title='Chameleon Skin Logo'>
+<img src='Chameleon.svg' width='220' align='left' title='Chameleon Skin Logo'>
 
 Chameleon is a highly customizable [MediaWiki][mw] skin that uses the
 [Bootstrap][twbs] framework.