Improve Routing docs

[afilina]

Q	A
Documentation	yes
Bugfix	no
BC Break	no
New Feature	no
RFC	no
QA	no

Description

Cleaning up the Laminas MVC routing documentation:

• Clean up the intro paragraphs.
• Give a simple but full config example using a Literal type.
• Explain in which file to put the routing config, since this is not obvious from any of the other pages.
• Make a bullet-point of the route types with a one-line explanation for each, then link to the appropriate heading in the laminas-router/routing docs. The idea is to avoid duplicating all the content from laminas-router in laminas-mvc.
• Note the version in which certain route types were deprecated and removed, in case someone lands here while upgrading an older application.
• Remove reference to laminas-console, since that package is no longer maintained.
• Simplify the note regarding last-in-first-out.

[Ocramius]

Nice cleanup, thanks @afilina!