feat: final pdf and presentation

chore: minor style fixes in documents

feat(4): chapter 4 is completed

feat(3): chapter 3 is completed

feat(2): chapter 2 is completed

Merge remote-tracking branch 'origin/main'

feat(1): chapter 1 is completed

fix(13): delete almost all STL (except iostream, stddef.h, stdexcept)

feat(13): task b completed

feat(13): task a completed

chore: Add all current code

create: README.md

chore: Chapter 4 completed

chore: Chapter 3 completed

fix: Minor fixes for chapter 1

fix: Minor fixes for chapter 2

chore: Move all chapter to separate dirs

chore: Chapter 2 completed

chore: Add Contact5 and Contact6

chore: Add another 2 contacts to container

feat: Add 2 contacts to container

Merge branch 'feature/footer'

feat: add footer