I'd want to know most used technologies on these sites. Also some general layout specifics like percent use of side navigation vs top navigation etc ...

According to blog.phymata.com/2012/12/28/what-is-a-developer-advocate/ "A developer advocate is someone who's primary responsibility is to make it easy for developers to use a platform. ( ... ) I view the role as having a foundation of three pillars: development, advocacy , and community". In my opinion though, it is a form of marketing that works with developers. See also "Technology Evangelists".

I would suggest Ionic 2. Specially if you are new to development. My suggestion is based a lot on the fact that you would be learning and using Angular 2 instead of Angular JS, and you would be able to write Typescript code instead of JS.