docs: mkdocs badge

README.md

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 Bio data is a little messy to work with, and everybody deserves a clean database. This package helps you to convert bio data to a database.
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 So far, there is only one function implemented: **convert uniprot data to postgresql**. This package focuses more on parsing the data and inserting it into the database, rather than curating the data.
 
-[📚 Documentation](https://deargen.github.io/bio-data-to-db/)
+[📚 Documentation](https://deargen.github.io/bio-data-to-db/) has the API reference and the usage.
 
 ## 🛠️ Installation