Changes proposed ✍️

• Create generic component for drawer component
• Update all component to use the app-drawer component
• Uniformize close buttons, drawer behaviour, and actions buttons styling
• Delete 3 unused components: conversation-form, conversation-list-filter, and conversation-settings
• Add support to loading icon in dialog component (github integration)
• Fix buttons styling in merge suggestions page

• Screenshots (front-end changes only)

Checklist ✅

• Label appropriately with type:feature 🚀, type:enhancement ✨, type:bug 🐞, or type:documentation 📜.
• Tests are passing.
• New backend functionality has been unit-tested.
• Environment variables have been updated
  • Front-end: frontend/.env.dist
  • Backend: backend/.env.dist, backend/.env.dist.staging, backend/.env.dist.staging.
  • Configuration docs have been updated.
  • Team members only: update environment variables in Password manager and update the team
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.
• All changes have been tested in a staging site.
• All changes are working locally running crowd.dev's Docker local environment.