chore(hw) Remove previous year's hw

I'd like to see worktrees covered in class 6.

git foo

git bar

baz

I've learnt

- what is the difference between HTTPS and SSH access to the repo;

- about some "standards" of managing a repo (e.g., a linear history vs keeping merge commits) and that there is no single "good" way (it depends on preferences of the group/project)

- that we have git stash and what it is good for

- some "advanced" information related to git commands and actions that I had already been using (commands like checkout, pull, push, merge, fetch)

Thanks guys, I'm really enjoying the course so far :)

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