docs: 📝 add roadmap (#301)

## Description

This PR adds the roadmap the main website (from the Community repo). I
will add a PR to remove it there as well.

Related to seedcase-project/community#78

## Reviewer Focus

<!-- Please delete as appropriate: -->
This PR needs a quick review.

## Checklist

- [X] Formatted Markdown
- [X] Rendered website locally

_extensions/quarto-ext/fontawesome/_extension.yml

@@ -0,0 +1,7 @@
+title: Font Awesome support
+author: Carlos Scheidegger
+version: 1.2.0
+quarto-required: ">=1.2.269"
+contributes:
+  shortcodes:
+    - fontawesome.lua