Add content for detection strategies

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.

Start with the unchecked checklist items for the website: remove Data Sources and add Detection Strategies to the Random Page list. Then review the LinkById stixtests entry point and the search and navigation changes already described. Done means the remaining website behavior works, while Excel and release-note support is coordinated with mitreattack-python issue 188.