add navigation information to pages for just-the-docs

Author: joonlabs

docs/getting-started.md

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+---
+layout: default
+title: Getting Started
+nav_order: 2
+has_children: false
+permalink: /docs/getting-started/
+---
 # Installation
 To install php-graphql, you basically have two options. You can either use composer or git submodules.
 

docs/index.md

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+---
+layout: default
+title: Introduction
+nav_order: 1
+has_children: false
+permalink: /docs/
+---
 # Introduction
 GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.
 

docs/parsing-validating-executing.md

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+---
+layout: default
+title: Parsing, Validation, Execution
+nav_order: 6
+has_children: false
+permalink: /docs/parsing-validating-executing/
+---
 # Introduction
 This section describes how parsing, validation and execution in a high level and should only be interesting for building an own processing pipeline or understanding how the GraphQL-Server works. 
 In all other cases the default `Server` should be fine to use.

docs/schema-definition.md

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+---
+layout: default
+title: Schema Definition
+nav_order: 3
+has_children: false
+permalink: /docs/schema-definition/
+---
 # Schema Definition
 The schema is a container for your type hierarchy that accepts object types as roots for the query type, and the mutation type. 
 It is passed to the validator and the executor and used to model your underlying data structures.

docs/server.md

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+---
+layout: default
+title: Server
+nav_order: 5
+has_children: false
+permalink: /docs/server/
+---
 # Server
 The default `Server` is a simple wrapper around a parser, validator and executor to save you work. 
 When constructing a server, simply pass the schema to the constructor and enable processing via the `listen()` function.

docs/types/directives.md

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+---
+layout: default
+title: Directives
+parent: Types
+nav_order: 7
+---
 # Directives
 A directive describes how the data should be processed at a meta level. 
 A directive can be attached to a field or fragment and can affect the execution of the query.

docs/types/enums.md

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+---
+layout: default
+title: Enums
+parent: Types
+nav_order: 3
+---
+
 # Enums
 Enumeration types are a special kind of scalar that is restricted to a particular set of allowed values and in this implementation handled as string values.
 

docs/types/index.md

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+---
+layout: default
+title: Types
+nav_order: 4
+has_children: true
+permalink: /docs/types/
+---
+
 # Types
 In **php-graphql**, types are represented as instances of a GraphQL-Type-Class. Supported built in types are:
 - ```GraphQLBoolean()```

docs/types/interfaces.md

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+---
+layout: default
+title: Interfaces
+parent: Types
+nav_order: 5
+---
 # Interfaces
 An Interface is an abstract type that includes a certain set of fields that a type must include to implement the interface.
 An Interface can never be returned directly but must be implemented by 'child types'.

docs/types/list-and-non-nulls.md

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+---
+layout: default
+title: Lists and Non-Nulls
+parent: Types
+nav_order: 4
+---
 # Lists and Non-Nulls
 Lists and Non-Nulls are wrapping types in GraphQL. This means, that they cannot be used solely, but must feature an inner type, which they hold.