Reorganize toctree to make previous roadmaps less preeminent (!215) · Merge requests · Platform / Development / swh-docs

This nests the historical roadmap under a specific roadmap/index toctree, so that they don't all show up in the sidebar.

Test Plan

Index page

Current roadmap page

Previous roadmaps index

Roadmap 2021 page

Migrated from D7484 (view on Phabricator)