Revert "HACK-587: stop the header from disappearing when changing tablet orientation, keep mobile header consistent"

This reverts commit 0e594ae81b28905193dbacdd0ced36dbf896a2fb.
Revert "HACK-587: fix headers on tablet and adjust on mobile"

This reverts commit 0e785a75067db007b3b09d2f6218c9d34d9dc750.
Revert "HACK-587: add header transition to other b-pages and mobile, remove old code"

This reverts commit 547a1c074fe8d3b2df34b6de0a02c83da8a54493.
Revert "HACK-587: make transition header for b-pages as well"

This reverts commit e1397d87707ba1ba7540964df184b8710f4a288d.
Revert "HACK-587: smooth header transition on home page"

This reverts commit 1ccaac61ecd3afe3b33e45a58a3ab19fac73f267.
Merge pull request #377 from thomkrillis/HACK-587

HACK-587: revert changes for persistent header