Bitcoin Core App Case Study

[mouxdesign]

This PR is to add the Bitcoin Core app case study to the guide. It's a very special project to the ecosystem, so far 3 people have reviewed the content of this PR:

• Christoph
• Michael
• Ferreyro Still need to work on copy further + images but this makes a first start.

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[GBKS]

I just updated the PR with the latest content of the Google Doc that we discussed last week in the jam session. Should be good for review now.

🏓Check the preview🏸

[rabbitholiness]

This looks great. I like the balance between the amount of content and the link for further reading 👍. The page is easy to read and give a good overview of the project. At the same time it provides access to a lot more detail for the interested readers.

The only small thing I noticed that the back link at the bottom of the page links to the Payjoin case study instead of to the Wallet Scrutiny one. All other links work as intended.