Add non-numbered version redirects for Building Blocks documentation

[sushmanthreddy]

Description

Added redirects for non-numbered versions of Building Blocks documentation pages to their numbered counterparts. This ensures that URLs without version numbers in the path will correctly redirect to the current numbered versions.

For example:

• docs/building-blocks/signatures.md → building-blocks/2-signatures.md
• docs/building-blocks/modules.md → building-blocks/3-modules.md

Changes

• Added 8 new redirects in mkdocs.yml for all Building Blocks documentation pages
• Maintains consistent URL structure while supporting both numbered and non-numbered paths
• No content changes, only URL routing updates

Testing

• Verified all new redirect paths resolve to correct numbered versions
• Existing redirects remain unchanged and functional

Notes

This change improves documentation accessibility by supporting more intuitive URLs while maintaining the organized numbered structure.