Refactor Week 5 Notes / Exercises

[mmcleod89]

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