remove duplicate asciidoc plugin and unused imagesdir config

[abhi-battula]

Description

Removed duplicate gatsby-transformer-asciidoc plugin declaration and cleaned up unused imagesdir configuration in Gatsby config.

The plugin was previously declared twice, and the imagesdir attribute pointed to an invalid path (static@). After testing, it was confirmed that imagesdir is not used in the current setup, as images are served directly from the static/ directory and referenced via metadata.

Fixes

Screenshots (if applicable)

Checklist

• PR title is clear and descriptive
• Changes follow project conventions
• No unrelated changes included
• Documentation updated if needed

Additional Context

• Verified by modifying imagesdir to a random path and confirming that image rendering was unaffected
• Ran gatsby clean, gatsby build, and served the public/ folder to validate no regressions

[hassaansaleem28]

Hi @abhi-battula, it seems like a duplicate of this issue and PR. Isn't it?

[krisstern]

Duplicate of #548