Fix links in contributing.md to use HTTPS

[partev]

Updated links in contributing guidelines to use HTTPS.

[gemini-code-assist[bot]]

Summary of Changes

Hello @partev, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a minor but important maintenance task: updating all external links within the docs/contributing.md file to use the secure HTTPS protocol. This change enhances the overall security posture of the documentation and ensures that users are directed to encrypted connections when accessing external resources, aligning with modern web best practices.

Highlights

• Protocol Update: All http:// links within docs/contributing.md have been updated to use https:// for improved security and consistency across the documentation.
• Documentation and Repository Links: Links pointing to JAX's official documentation (docs.jax.dev) and the JAX GitHub repository (github.com/jax-ml/jax) have been standardized to use the secure HTTPS protocol.
• URL Standardization: The git remote add upstream command in the contributing guidelines now uses https://github.com/jax-ml/jax, removing the www subdomain for consistency.

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[partev]

@jakevdp I think this is ready to be merged

[partev]

@jakevdp in the sentence:

• Contributing in any of the above ways to the broader ecosystem of libraries built on JAX

the link to "libraries built on JAX" is also broken. The closest thing to it is https://docs.jax.dev/en/latest/#ecosystem, should include that fix as well in this PR?