Update local development setup instructions in CONTRIBUTING.md and template

[Naman-Priyadarshi]

Pull Request description

This pull request updates the CONTRIBUTING file for scicookie and the template to provide accurate and up-to-date instructions for setting up the project locally. The previous instructions were outdated and misleading, as they referenced a setup.py file that does not exist in the repository.

Changes Made:

Updated the CONTRIBUTING.md with clear and concise instructions for local development setup.
Removed references to the nonexistent setup.py file.
Provided alternative installation methods such as Poetry (poetry install) and pip (pip install -e .).
Replaced $ with Code Blocks
Fixed Issue in template where instructions said tox and flake8 but referenced make lint and make tests

Fixes #203

How to test these changes

• ...

Pull Request checklists

This PR is a:

• bug-fix
• new feature
• maintenance

About this PR:

• it includes tests.
• the tests are executed on CI.
• the tests generate log file(s) (path).
• pre-commit hooks were executed locally.
• this PR requires a project documentation update.

Author's checklist:

• I have reviewed the changes and it contains no misspelling.
• The code is well commented, especially in the parts that contain more complexity.
• New and old tests passed locally.

Additional information

Reviewer's checklist

Copy and paste this template for your review's note:

## Reviewer's Checklist

- [ ] I managed to reproduce the problem locally from the `main` branch
- [ ] I managed to test the new changes locally
- [ ] I confirm that the issues mentioned were fixed/resolved

[Saransh-cpp]

Thanks for taking this up, @Naman-Priyadarshi! A few comments below -

[Naman-Priyadarshi]

I have resolved the changes. Also, I replaced the flake8 and tox step with adding a pre-commit section. Let me know how it looks!

[Saransh-cpp]

Looks good, thanks @Naman-Priyadarshi!

[github-actions]

🎉 This PR is included in version 0.7.0 🎉

The release is available on:

• 0.7.0
• GitHub release

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