chore(docs): remove openbase badge

openbase has been shut down in 2023, so this badge does not work anymore

Author: lubber-de

README.md

@@ -6,7 +6,6 @@ The official community fork of the popular Semantic-UI framework.
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 [![License](https://img.shields.io/github/license/fomantic/Fomantic-UI?color=%233fb911)](https://github.com/fomantic/Fomantic-UI/blob/1fd94d2479f297c906bed557f0567d1d3f0a4d2c/LICENSE.md)
-[![Rate on Openbase](https://badges.openbase.io/js/rating/fomantic-ui.svg)](https://openbase.io/js/fomantic-ui?utm_source=embedded&utm_medium=badge&utm_campaign=rate-badge)
 
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