added jekyll-sitemap to gemfile

Read here : https://github.com/jekyll/jekyll-sitemap
removed md from produce reports

changed to
corrected path in main button
removed html for test
updated R
resoved data man old tutorial
all rmds work
Revert "added jekyll-sitemap to gemfile"

This reverts commit e784d7f51a975d642c2806ba15d3f590883ec726.
updated website