Added page titles and some descriptions

Author: DsposalTom

docs/1_Start_Here/1_1_Introduction.md

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+---
+title: Introduction
+description: Introduction to the Open3P open data standard for the plastic value chain.
+---
+
 # Introduction
 
 ## What is the Open3P?

docs/1_Start_Here/1_2_Key_Concepts.md

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+---
+title: Key Concepts
+description: The key concepts to understanding the open data standard for the plastic value chain.
+---
+
 # Key Concepts
 
 ## Material Catalogue

docs/1_Start_Here/1_3_Data_Flow.md

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+---
+title: Data Flow
+description: The intented flow of data through the plastic value chain using Open3P.
+---
+
 # Data Flow
 
 Here, we show two examples of how data could flow using the open standard. This tells the story of how water bottles are created with a packaging manufacturer, how that packaging manufacturer sends their packaging to a packer/filler (Figure 1), and then how that packer/filler will put packaging together, filled with a product and then send them to a retailer (Figure 2). In both figures: 

docs/1_Start_Here/1_4_Data_Schema.md

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+---
+title: Data Schema
+description: The current data schema of the Open3P open data standard for the plastic value chain.
+---
+
 # Data Schema
 
 <figure markdown>

docs/2_Data_Formats/2_1_Data_Formats.md

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+---
+title: Data Formats
+description: The data formats that should be used.
+---
+
 # Data Formats
 
 When publishing Plastic Packaging Portal data, the csv format should be used. csv files can be created and edited in text editors, as well as spreadsheet packages such as Microsoft Excel, Apple Numbers, or Open Office.

docs/3_Data_Specification/3_1_Material_Catalogue.md

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+---
+title: Materials Catalogue
+---
+
 # Materials Catalogue
 
 Materials should be provided as a separate csv file, in tidy format. This means that each row of the csv file should be one material that is combined in the materials csv to create combinations. An example is provided.

docs/3_Data_Specification/3_2_Material.md

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+---
+title: Materials
+---
+
 # Materials
 
 Materials should be provided as a separate csv file, in tidy format. This means that each row of the csv file should be one material for a component. An example is provided.

docs/3_Data_Specification/3_3_Component_Catalogue.md

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+---
+title: Component Catalogue
+---
+
 # Component Catalogue
 
 ## Standard Spreadsheet Format

docs/3_Data_Specification/3_4_Complete_Packaging.md

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+---
+title: Complete Packaging
+---
+
 # Complete Packaging
 
 We can now use the unique components, to create a complete packaging. Each row refers to the complete package.

docs/3_Data_Specification/3_5_Multipack.md

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+---
+title: Multipack
+---
+
 # Multipack
 
 If the complete packaging is further combined to create multipacks, the information is collected here. Each row corresponds to a single packaging item.