readme: fix link formatting

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 [![alt text](https://readthedocs.org/projects/docs/badge/?version=latest "Documentation Status")](http://esp-idf.readthedocs.io/en/latest/?badge=latest)
 
-ESP-IDF is the official development framework for the `ESP32 <https://espressif.com/en/products/hardware/esp32/overview>`_ chip.
+ESP-IDF is the official development framework for the [ESP32](https://espressif.com/en/products/hardware/esp32/overview>) chip.
 
 # Developing With the ESP-IDF