Set theme jekyll-theme-cayman and migrate Page Generator content

Author: oroulet

_config.yml

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+title: Freeopcua.github.io
+description: "FreeOpcUa: Open Source C++ and Python OPC-UA Server and Client Libraries and Tools"
+google_analytics: 
+show_downloads: true
+theme: jekyll-theme-cayman
+
+gems:
+  - jekyll-mentions

index.html

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+FreeOpcUa is a project to implement an open-source (LGPL) OPC-UA stack and associated tools. 
+
+Currently FreeOpcUa is composed of
+* A LGPL C++ library to develop server and client OPC-UA applications. Python bindings can be found in the opcua-python repository. https://github.com/FreeOpcUa/freeopcua
+* A Python OPC-UA Python Client and Server library, written entirely in python, available at: https://github.com/FreeOpcUa/python-opcua (install using pip install opcua)
+* A simple GUI client https://github.com/FreeOpcUa/opcua-client-gui (install using pip install freeopcua-client)
+* Command line tools installed with freeopcua-python https://github.com/FreeOpcUa/python-opcua/tree/master/tools 
+* A GUI to create OPC UA nodes and save them to xml https://github.com/FreeOpcUa/opcua-modeler
+
+* Mailing list: https://groups.google.com/forum/#!forum/freeopcua
+* Source code: https://github.com/FreeOpcUa
+
+Screenshot of client GUI:
+
+
+![Screenshot](/screenshot.png?raw=true "Screenshot")
+
+Screenshot of modeler:
+
+
+![Screenshot](/screenshot-modeler.png?raw=true "Screenshot")