Use correct img syntax for README

Author: eelcoj

README.md

@@ -3,8 +3,7 @@
 An Astro documentation site theme, built with Tailwind CSS.
 
 
-<img src="https://user-images.githubusercontent.com/988051/183708900-d2945c3b-8ff5-4aff-a3c1-98335cc90277.jpg" alt="preview of the Astro documentation theme, built with Tailwind CSS" />
-![Preview of astro docs](https://github.com/spinalcms/astro-docs-template/blob/main/docs/astro-docs-preview.jpg?raw=true)
+<img src="https://github.com/spinalcms/astro-docs-template/blob/main/docs/astro-docs-preview.jpg?raw=true" alt="preview of the Astro documentation theme, built with Tailwind CSS" />
 
 
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