Suggestion: Include a reference to the Book of BDK in the bitcoindevkit.org

When searching for the bitcoindevkit project, the first result was the bitcoindevkit.org site. That site is about the project and very good for what is does. I was looking for the "Get Started" or tutorial. I knew of the Book of BDK, so I searched for it as my source of tutorial. I mention all of this to say that it may be useful to add a link on the main bitcoindevkit.org page to the Book of BDK. I don't have any design abilities so I am not making the suggestion of whether it should be its own tab or something else. The suggestion is to allow devs to more easily find the tutorial.

Start at the main bitcoindevkit.org page and inspect how existing navigation or prominent links are organized. Add an easy-to-find link to the Book of BDK, then verify that visitors can reach the tutorial from the main page.

Written by the indexing model from the issue text.