Add comprehensive testing infrastructure to validate Jekyll site functionality#21

Copilot wants to merge 3 commits intomainICTASL/capacity-building:mainfrom

copilot/fix-94a58eed-9847-4a32-bdb2-0b3438d1f36aICTASL/capacity-building:copilot/fix-94a58eed-9847-4a32-bdb2-0b3438d1f36aCopy head branch name to clipboard