This is a retroactive ticket to track Isarra's implementation of a responsive layout for MonoBook, so it will have a mobile optimized layout for smaller devices, while still retaining the desktop look that we all know so well. It can be tested on <https://en.wikipedia.beta.wmflabs.org/wiki/Main_Page?useskin=monobook>.
Commits:
* https://gerrit.wikimedia.org/r/#/c/421199/
* https://gerrit.wikimedia.org/r/#/c/421652/
* https://gerrit.wikimedia.org/r/#/c/434047/
Previous discussions:
* https://lists.wikimedia.org/pipermail/wikitech-l/2018-April/089730.html
* https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)/Archive_165#Responsive_MonoBook
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