Steps

• Swap specific articles
• Merge/Split specific articles
• Update redirects
• Update reference links (Index-page, instead of concrete pages)
  • Remove old cross-linking to sections
• Update both locales (ru, en)
• Check cross-pagination
• Reorder some items if needed (e.g. - concepts by difficulty)
• Group some items if needed (promo & history & mission ...)
• (Maybe) Add old decompose view for compatability
• Add redirect page map (for old users)