Installation from source - better instruction

[rchojn]

Current installation from source instruction required proper access rights to repository. It should be changed to use https instead of ssh

[techeverri]

Yeah, I get the same error 💥

➜ git clone git@github.com:supercrabtree/k.git $HOME/k
Cloning into '/Users/techeverri/k'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.