chore: delete duplicate .md docs superseded by canonical .adoc (Item 11) (#146)

Estate convention: AsciiDoc canonical. Removed stale .md duplicates of an
existing .adoc sibling.

Deleted: affinescriptiser/CONTRIBUTING.md

Co-authored-by: hyperpolymath <hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: hyperpolymath