Remove ++ symbols from exhibition stand games blog post (#232)

The markdown links were wrapped in unnecessary ++ symbols
(e.g. ++[link text](URL)++). Removed all occurrences to use
standard markdown link syntax.

https://claude.ai/code/session_01YBgsRyACNZGocAPxDXwnSv

Co-authored-by: Claude <noreply@anthropic.com>

Author: stefan-burke