docs: add canonical tag for 3.3, 3.4, 4.0, 4.1 and 4.2 and fix a few redirects (!28375) · Merge requests · Bootstrap / bootstrap

Merged XhmikosR requested to merge gh-pages-xmr into gh-pages Feb 28, 2019

I really hope I don't have to do this again and this fixes the SEO issue once and for all...