docs: remove Research Preview banner from Missions on Desktop/Web (#1216)

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: oliver-factory

docs/web/missions.mdx

@@ -4,10 +4,6 @@ description: Use Factory Missions in the Desktop and Web app to plan and execute
 keywords: ['factory missions', 'missions', 'web', 'desktop', 'orchestration']
 ---
 
-<Note>
-  Missions on Desktop/Web is currently in **Research Preview**.
-</Note>
-
 <Frame>
   <div style={{ backgroundColor: '#f4f4f5', padding: '0.25rem', borderRadius: '0.5rem' }}>
     <img src="/images/mission-web.png" alt="Mission Control orchestration view" style={{ borderRadius: '0.25rem' }} />