🍱 MQT branding (#20)

Just a small update to the MQT branding that removes some unnecesary
files ands some alt texts.

README.md

@@ -80,20 +80,20 @@ The Munich Quantum Toolkit has been supported by the European Research Council (
 <p align="center">
 <picture>
 <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/cda-tum/mqt-qudits/main/docs/_static/eu_funded_dark.svg" width="25%">
-<img src="https://raw.githubusercontent.com/cda-tum/mqt-qudits/main/docs/_static/eu_funded_light.svg" width="25%">
+<img src="https://raw.githubusercontent.com/cda-tum/mqt-qudits/main/docs/_static/eu_funded_light.svg" width="25%" alt="Funded by the European Union">
 </picture>
 <picture>
 <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/tum_dark.svg" width="20%">
-<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/tum_light.svg" width="15%">
+<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/tum_light.svg" width="15%" alt="TUM Logo">
 </picture>
 <picture>
-<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/logo-bavaria.svg" width="12%">
+<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/logo-bavaria.svg" width="12%" alt="Coat of Arms of Bavaria">
 </picture>
 <picture>
 <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/erc_dark.svg" width="20%">
-<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/erc_light.svg" width="20%">
+<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/erc_light.svg" width="20%" alt="ERC Logo">
 </picture>
 <picture>
-<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/logo-mqv.svg" width="18%">
+<img src="https://raw.githubusercontent.com/cda-tum/mqt/main/docs/_static/logo-mqv.svg" width="18%" alt="MQV Logo">
 </picture>
 </p>