Link to the Principles page from other pages in the Guide #191
Description
In #144 We've added a new page called Principles which you can preview here https://bitcoin.design/guide/foundations/principles/
This task is simple, whoever takes on this issue, should see where in the Guide could be a good idea to link to the Principles page. It can be either to the page itself or of course to a specific principle, for example, security https://bitcoin.design/guide/foundations/principles/#security