Recategorise SpecShield: add security and mcp, drop misc - #818

Changed pages include:

• index.html - view
• 404.html - view
• badges/index.html - view
• contributing/index.html - view
• legacy/index.html - view
• sponsor/index.html - view
• tools/index.html - view
• collections/arazzo/index.html - view
• collections/openapi-v3-2-early-adopters/index.html - view
• collections/opensource/index.html - view

There are more changes not included in the list