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

• My PR is based on a package issue and I have explicitly linked it.
• I have included the target issue or issues in the PR title as follows: issue-number: PR title
• I have tested my changes locally.
• I have added or updated unit tests where necessary.
• I have updated the documentation if required.
• I have built the package locally and run rebuilt docs using roxygen2.
• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

❗ 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

@@            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              

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