Issue #784 - Add an entry for the scoringutils paper on the pkgdown site

[nikosbosse]

Description

This PR closes #784.

After failing to get the manuscript into the package as a vignett (see #796), this PR now adds an entry to the pkgdown site with a link to the scoringutils paper.

Specifically, this PR

• updates the pkgdown yaml file to achieve that
• makes a small update to the manuscript itself (making a heatmap readable by rounding results to 2 digits).

The result looks like this:

Checklist

• [x] My PR is based on a package issue and I have explicitly linked it.
• [x] I have included the target issue or issues in the PR title as follows: issue-number: PR title
• [x] I have tested my changes locally.
• [x] I have added or updated unit tests where necessary.
• [x] I have updated the documentation if required.
• [x] I have built the package locally and run rebuilt docs using roxygen2.
• [x] My code follows the established coding standards and I have run lintr::lint_package() to check for style issues introduced by my changes.
• [ ] ~I have added a news item linked to this PR.~
• [ ] I have reviewed CI checks for this PR and addressed them as far as I am able.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.62%. Comparing base (948f251) to head (8d8cf9f). Report is 21 commits behind head on main.

:exclamation: Current head 8d8cf9f differs from pull request most recent head 59c3618. Consider uploading reports for the commit 59c3618 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #797 +/- ## ========================================== + Coverage 95.60% 95.62% +0.02% ========================================== Files 21 21 Lines 1569 1577 +8 ========================================== + Hits 1500 1508 +8 Misses 69 69 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.