[UX] Web app for marketing site and management portal

[flanakin]

Marketing site

• Add react-ts Vite template #982
• [UX] Clean up Vite boilerplate content #1021
• [UX] Add CSS reset #1031
• [UX] Migrate existing markdown content to TSX pages #1056
• [UX] Home page layout #1082
• [UX] Add page navigation
• [UX] Script to deploy to GH Pages
• [UX] Test framework #1058
• [UX] GitHub action to run tests
• [UX] Telemetry
• [UX] Add Fluent UI library #1081
• [UX] Replace all icons used for the different tools #1386
• [UX] Create a dedicated page for learning resources

Management portal

• Add authentication #1387
• Hubs: List of instances
• Hubs: Create form
• Hubs: Details page (essentials, scopes, datasets)
• Hubs: Edit configuration settings form
• Hubs: Add scopes
• Hubs: Remove scopes
• Hubs: Data health page (scopes/dataset completeness)
• Hubs: Backfill data