Remove image markup from README

Removed image markup for GitHub Preview Updater.

Author: andrey-helldar

README.md

@@ -1,10 +1,5 @@
 # GitHub Preview Updater
 
-<picture>
-    <source media="(prefers-color-scheme: dark)" srcset="https://banners.beyondco.de/GitHub%20Preview%20Updater.png?pattern=topography&style=style_2&fontSize=100px&md=1&showWatermark=1&icon=photograph&theme=dark&packageManager=uses%3A&packageName=TheDragonCode%2Fgithub-preview-updater%40v2&description=Lightweight+preview+update+in+your+repository&images=photograph">
-    <img src="https://banners.beyondco.de/GitHub%20Preview%20Updater.png?pattern=topography&style=style_2&fontSize=100px&md=1&showWatermark=1&icon=photograph&theme=light&packageManager=uses%3A&packageName=TheDragonCode%2Fgithub-preview-updater%40v2&description=Lightweight+preview+update+in+your+repository&images=photograph" alt="GitHub Preview Updater">
-</picture>
-
 ## Overview
 
 [banners.beyondco.de](https://banners.beyondco.de) is a service that generates beautiful social preview banners for