Fix meta initial-scale (& also remove useless minimal-ui)

poke @bloodyowl, in case you do the mistake all the times :)
ref https://github.com/cssnext/cssnext.github.io/pull/5
Fix typo
Merge pull request #316 from Rorto/patch-1

Fix typo
Update index.md

correction orthographe ligne 34 (sont -> son)
Merge pull request #324 from gostbuster/patch-1

correction orthographe