Adds application integration for stand-alone usage to the documentation

[weierophinney]

Related to laminas/documentation#8

---

Originally posted by @froschdesign at zendframework/zend-view#190

[weierophinney]

@weierophinney
The idea based on various support questions and was first test during the rework of zend-i18n documentation.

The preview of zend-i18n goes one step further and contains one more example: "Usage in a Slim Application"

---

Originally posted by @froschdesign at zendframework/zend-view#190 (comment)

[weierophinney]

An example which illustrates the usage with a layout script should be added.

---

Originally posted by @froschdesign at zendframework/zend-view#190 (comment)