Pull request summary from GitHub Copilot:

> This pull request updates the `README.md` file to use secure HTTPS
links instead of HTTP for the Dyad website. This improves security and
ensures users are directed to the correct, secure version of the site.
> 
> - Documentation improvements:
> * Changed all `http://dyad.sh/` links to `https://dyad.sh/` in the
`README.md` file.

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Updated README links from http to https for dyad.sh to ensure secure,
correct navigation.
This avoids insecure redirects and aligns with best practices.

<sup>Written for commit fbfd253f49495e6e9c1f72cca28213eb65303b5b.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->