Fix Weights and Biases Logging and paths

Hey 👋, I noticed a few errors in the codebase, this PR aims to solve some of them.

Create a minimal .gitignore file, for python and wandb.
Fix wandb.init() statements for the case when no group_vars are provided.
Most paths were of the form /home/* which might lead to permission errors on systems with non-root access, I simply substituted them with ./

hlml / fortuitous_forgetting