Add content for detection strategies

[adpare]

Add relevant pages to the website to incorporate new detection strategies.

• Update the bottom of Technique pages to link to the new detection strategies (@adpare)
• Create overview pages for (@clemiller)
  • Detection Strategies (url: /detectionstrategies/)
  • Analytics (url: /analytics/)
  • Data Components (url: /datacomponents/)
• Create individual pages for (@clemiller)
  • Detection Strategies (url: /detectionstrategies/DET)
  • Data Components (url: /datacomponents/DC)
• Update navbar (@clemiller)
  • Remove Data Source pages
  • Add Detections, with a submenu for Detection Strategies, Analytics, and Data Components
• Remove Data Sources from "Random Page" list
• Add Detection Strategies to "Random Page" list
• Update LinkById stixtests to support DC/DS schema changes (@clemiller)
• Make sure search functionality works for new objects
• Make sure the Excel files have the three new object types. This will need to be addressed in the mitreattack-python library (issue)
• Make sure the release notes are generated correctly with Detection Strategies, Analytics, and Data Components. This will need to be addressed in mitreattack-python as well.

This preview from the July 15, 2025 blog post could be incorporated into a Detection Strategy page.