* Refactoring in preparation for AMP support

* infrastructure for AMP validation

* Add Metrika counter on AMP page + adjust layout

* more content fixes

* improve amp layout

* improve navigation

* Move converting admonitions to generation time

* strict amp test check

* Batch AMP validation

* Add date published/modified to docs articles and their ld+json meta

* few more content fixes

* improve ld+json meta

* adjust margins

* skip published/modified for stable release docs

* adapt single page mode

* update po

* skip published/modified for single page docs

* update po

* adjust layout

* adjust layout