Move aops-generated files under a hidden directory

[exdx]

When running tools like avalancheup-aws frequently, many files get generated: spec files, prometheus rules, etc. These are all by default written to the user's home directory. It may make sense to move them into a separate hidden directory to not clutter the user's home directory, for example .aops or .avalanche-ops. Other avalanche tooling like avalanche-cli, avalanche-network-runner, and avalanchego all use a hidden home directory for their data.

This change would involve updating all the docstrings to point to the new directory.