chore: update links

README.md

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+<h4><a href="https://github.com/jina-ai/examples/tree/master/x-as-service">From BERT-as-Service to X-as-Service</a></h4>
+Learn how to use Jina to extract feature vector using any deep learning representation
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 <h4><a href="https://github.com/jina-ai/examples/tree/master/urbandict-search">Build a BERT-based NLP Semantic Search System in 3 minutes</a></h4>