Content - Jekyll: Restore méli-mélo meta.md files in site config (#2752)

Reverts #2747... which caused meta.md data to become irretrievable in practice (despite my tests seemingly working).

Will need to go back to the drawing board to come up with a better solution.

Author: EricDunsworth

_config.yml

@@ -113,4 +113,3 @@ exclude:
 - vendor/gems/
 - vendor/ruby/
 - ~sites/
-- méli-mélo*/**/meta.md