Shortened the slug for the old posts.
Shortened the slugs and renamed the files. Git: you are such a git!
Added a new post of deprecating logical subsetting in R.
Revert "Added a new post of deprecating logical subsetting in R."

This reverts commit a52153fb6ab2c7c3904a8ad7fd670c472f018940.
Revert "Revert "Added a new post of deprecating logical subsetting in R."" I really need to learn git better.

This reverts commit b057f9ad36680473d6fd8fade6b7ec770fc19ac8.