Update README and _pkgdown.yml for improved documentation and badge v…

[ehrlinger]

This pull request updates the documentation and configuration for the ggRandomForests package website, focusing on improving badge displays, updating URLs, and enhancing the package reference organization in the site navigation.

Documentation and badge improvements:

• Added a new badge to the README.md to display the R package version from GitHub.
• Updated the badges shown in the pkgdown site sidebar to include CRAN version, development version, R-CMD-check, Codecov coverage, CRAN downloads, and DOI, and changed the badge section title to "Package status".

Website configuration and navigation:

• Changed the site URL in _pkgdown.yml to use HTTPS.
• Improved the sidebar and navbar structure, adding a "dev" section and reorganizing navigation items for clarity.
• Added a detailed reference section in _pkgdown.yml, grouping package functions by theme (e.g., Forest Objects, Training Error, Variable Importance, Survival Analysis, Utilities), and added articles and news sections for better documentation and release tracking.…isibility

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.37%. Comparing base (8e3251b) to head (96f0b97).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   83.37%   83.37%           
=======================================
  Files          23       23           
  Lines        1816     1816           
=======================================
  Hits         1514     1514           
  Misses        302      302           

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