Workspace-level option for GitHub-style Markdown alerts

Summary I would like to propose an optional, workspace-level callout style that supports GitHub-compatible Markdown alerts alongside Outline's existing notices. Outline currently supports four notice types: • Success • Info • Tip • Warning These are exported using Outline's fenced Markdown syntax: GitHub and Gitea support five alert types: • NOTE • TIP • IMPORTANT • WARNING • CAUTION Their Markdown syntax is: This creates a compatibility issue when documents are exchanged between Outline and platforms that support GitHub-style alerts. --- Proposed behavior Add a workspace-level setting under: Settings → Workspace → Details → Callout style with two available values: 1. Outline notices — the existing and default behavior 2. GitHub alerts — GitHub-compatible callouts Workspace setting The selected style applies to the entire workspace rather than individual user…