doc: attempt to get the ayni JS into all head tags

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
(cherry picked from commit 35663fa55ac1579a3b0c8b67028a3a8dfea87b48)
doc: fix missing bracket

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
(cherry picked from commit 69638dfaeb0dcd96dac4b5f5c00ed08042432487)
doc: add note on soft JS dependency for navigating docs

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
(cherry picked from commit 657be818375bea2d8b5998ea1e5505eedc2f294d)