[Feature flags] Website Documentation ☂️

[laurenmrice]

Acceptance criteria

With the implementation of Feature Flags for some of our components, we need to create website documentation to explain feature flags in a general way somewhere on the website and document which components have feature flags for individual components.

Research and design iterations

Beta Give feedback

1. [Feature Flags] Explore possible directions for documentation #3999
   role: design ✏️ role: research 👓 type: docs 📖 type: enhancement 💡 version: 11 version: 12 +6
   
2. [Feature Flags] Revise documentation direction with feedback from playback #4153
   role: design ✏️ type: docs 📖 type: enhancement 💡 +3
   
3. [Feature flags] Narrow down iterations and create final designs #4186
   role: design ✏️ type: docs 📖 type: enhancement 💡 +3
   

Website docs

Beta Give feedback

1. [Feature Flags] Add guidance to Overview Components tab, Feature flag tab, and FAQs page #3975
   role: design ✏️ type: docs 📖 type: enhancement 💡 +3
   
2. [Feature Flags] Structured list: add feature flag content to Usage, Style, and Code tabs #4224
   component: structured-list role: design ✏️ type: docs 📖 type: enhancement 💡 +4
   
3. [Feature Flags] Tile: add feature flag content to Usage, Style, and Code tabs #4225
   component: tile role: design ✏️ type: docs 📖 type: enhancement 💡 +4
   
4. [Feature Flags] Modal: add feature flag content to Usage and Code tabs #3993
   component: modal role: design ✏️ type: docs 📖 type: enhancement 💡 +4
   
5. [Feature Flags] Overflow menu: add feature flag content to Usage and Code tabs #4223
   component: overflow-menu role: design ✏️ type: docs 📖 type: enhancement 💡 +4
   
6. [Feature Flags] Tree view: add feature flag content to Usage and Code tabs #4226
   component: treeview role: design ✏️ type: docs 📖 type: enhancement 💡 +4
   
7. [Feature Flags] Notification: add feature flag content to Usage and Code tabs #4222
   component: notification role: design ✏️ type: docs 📖 type: enhancement 💡 +4