Add "Supported By Posit" badge to modeldb website

[jeroenjanssens]

Overview

This PR adds the "Supported by Posit" badge to the modeldb website.

Background

We've recently started adding a "Supported by Posit" badge across all Posit package websites to create a more cohesive brand presence. The badge appears on the far right of the top navigation bar or at the bottom of the hamburger menu. It links to Posit’s main website. @hadley is involved with this initiative.

The following websites already have the "Supported by Posit" badge: ggplot2, Great Tables, gt, Plotnine, Pointblank, pointblank, and Quarto.

See https://posit-dev.github.io/supported-by-posit/ for more information.

Changes

• Added a line to _pkgdown.yml to include the JavaScript file
• Standardized indentation in _pkgdown.yml

Screenshots

At 1200px browser width:

At 992px browser width:

At 991px browser width: