Creates a new «routines» page :sparkles:
Creates a new «routines» page :sparkles:

Initially to close #1032.

It will help also with #2059, #1518, #1045 and #1747.

Initially, `emit` has been added to a `control` section. Could be
moved later on.

stmuk/doc,stmuk/doc,MasterDuke17/doc,MasterDuke17/doc,jonathanstowe/doc,dmaestro/doc,tbrowder/doc,MasterDuke17/doc,dmaestro/doc,dmaestro/doc,perl6/doc,stmuk/doc,tbrowder/doc,perl6/doc,jonathanstowe/doc,dmaestro/doc,stmuk/doc,jonathanstowe/doc,stmuk/doc,tbrowder/doc,jonathanstowe/doc,perl6/doc,MasterDuke17/doc,tbrowder/doc,perl6/doc,perl6/doc,dmaestro/doc,jonathanstowe/doc