Refactor Week 5 Notes / Exercises

Libraries week 
- Keeping same library example for now 
- keeping menti questions 
- replace conan example with a more thorough cmake example 
- include compiling to library with cmake (simple example) 
- header only vs precompiled libraries (probably not static vs dynamically linked unless a compelling example is thought of)

@krishnakumarg1984 working on it 