Add a roadmap page to the documentation (#5571)

Describe what the project will and will not do over the next year,
and point to issue #3453 for the open question of a 4.0 release.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/mkdocs.yml

@@ -317,6 +317,7 @@ nav:
       - community/contribution_guidelines.md
       - community/quality_assurance.md
       - community/governance.md
+      - community/roadmap.md
       - community/security_policy.md
 
 # Extras