Suggestion: Use PGXN no_index field to prevent over-indexing

[theory]

Saw the releases on PGXN—nice! In case you don't want it to index and list all of those files, use the PGXN META.json no_index field to tell it not to index specific files or directories.

Also consider using .github export-ignore to prevent the .github directory (or any other files or directories) from inclusion in the distribution, like this.