Feature request: Add `contributor-graphs` plot to each pipeline page.

It'd be nice to use https://ewels.github.io/contributor-graphs/ to generate a report for every pipeline automatically, and show this on the pipeline pages.

A few ways to do this, the one that strikes me as being cleanest / simplest is:

• Create a new repo for reports
• Have a GitHub Actions workflow that runs on cron and generates reports for every pipeline
• Commit the generated reports as HTML and SVG to that repo
• Set up a GitHub Pages website on that repo to host the HTML reports
• nf-core website pages embed the static HTML
• Make the SVGs + button link to the HTML report on GitHub Pages

This approach means no interactive plot within the nf-core website directly, but keeps the website lean and lightweight.

Other options:

1. Similar to above, but use an iframe and embed the HTML report
2. Build a javascript library and data export into contributor-graphs and render in-page directly
3. ..something else I haven't thought of

No repository file or test is named. Start by reading the existing pipeline-page implementation and the contributor-graphs documentation, then confirm which hosting and integration approach maintainers want; done means every pipeline page exposes an automatically generated report.