[RFC] Fix make rules path and env var

[hvignolo87]

Description

These are simple changes, just:

• Fixed a path in the make rules related to linting and formatting
• Removed extra spaces in the .env.services.local.example file
• Fixed a typo in the README.md
• Added new scopes to the CONTRIBUTING.md guide
• Set docs dependencies group as optional

Checklist

• I have performed a self-review of my code.
• I have added "RFC: " to my PR title when it's ready ("WIP: " or "Draft: " before that).
• Requested a person to review my pull request.
• Commented my code, particularly in hard-to-understand areas.
• My code follows the style guidelines of this project.
• Public functions/methods have adequate docstrings.
• Made corresponding changes to the documentation.