* Fix NelmioApiDocBundle view customization instructions
"Just create a file..." was not OK (missing views/ subdirectory, wrong SwaggerUi case)
The path showcased as code-block's first row was OK
* View customization instructions: remove unnecessary /views/ subdirectory
* Allow to override certain parts of the template
* Twig template can be defined via config
* Blocks can be used to override/extend only parts of the template
* Fix spelling in documentation
* Fix extension configuration tree
* Fix unit tests by making constructor argument optional
* Add fonts block and split swagger initialization into own block
* Fix code style
* Remove Google fonts, remove configuration and add changelog entry
* Remove template argument from service definition
* Add correct path for overriding template
* Move re-add of Google Fonts to FAQ section in documentation.
* Remove unused class import
