Fix link to binder RTD on preparing your repo
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- <span class="front-em">We build a Docker image of your repository</span><br />Binder will search for a dependency file, such as requirements.txt or environment.yml, in the repository's root directory (<a href="#">more details on more complex dependencies in documentation</a>). The dependency files will be used to build a Docker image. If an image has already been built for the given repository, it will not be rebuilt. If a new commit has been made, the image will automatically be rebuilt.
+ <span class="front-em">We build a Docker image of your repository</span><br />Binder will search for a dependency file, such as requirements.txt or environment.yml, in the repository's root directory (<a href="https://mybinder.readthedocs.io/en/latest/preparing.html">more details on more complex dependencies in documentation</a>). The dependency files will be used to build a Docker image. If an image has already been built for the given repository, it will not be rebuilt. If a new commit has been made, the image will automatically be rebuilt.
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