2.2.10
#3272 fixes comment
Merge pull request #5148 from Banandrew/5128
#4279, preserve em units for math, fix h1-h5 to use exact decimals as well
Update README.md
Update semantic.less links
Setup embed component, fix all contributors banners in src
#3009, fix issue where theme will fail building if packaged theme does not include site.variables