docs: fix badges

[ci skip]

README.md

@@ -171,5 +171,3 @@ Support this project by becoming a sponsor. Your logo will show up here with a l
 <a href="https://opencollective.com/wikijs/sponsor/7/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/7/avatar.svg"></a>
 <a href="https://opencollective.com/wikijs/sponsor/8/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/8/avatar.svg"></a>
 <a href="https://opencollective.com/wikijs/sponsor/9/website" target="_blank"><img src="https://opencollective.com/wikijs/sponsor/9/avatar.svg"></a>
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