Make scripts executable, add basic pre-commit setup

[mdeweerd]

Changes to execute ingest.py and privateGPT.py without needing to manually add python3 for executing them.

Also added a "minimal" pre-commit configuration that will not make major changes to the files - for now it removed some spaces at the end of the lines. It also checks spelling, yaml format (useful for the docker configuration that is prepared in another PR).

[imartinez]

Should we include pre-commit in requirements and update the Readme to explain how to use it (run pre-commit install)?

[mdeweerd]

When it's mentionned, it's mentionned in a file such as "CONTRIBUTING.md" (example).

I can add such a file with an instruction just for that.

[imartinez]

When it's mentionned, it's mentionned in a file such as "CONTRIBUTING.md" (example).

I can add such a file with an instruction just for that.

We can leave it for the near future. We could be creating a section on how to contribute.