New sections in the FRED documentation

Greetings everyone, we've spent some time trying to improve the docs for people just getting to know the software. I'm sending a pre-release build of the documentation with added overview and quickstart guide sections. The admin guide also has added troubleshooting section with some commonly encountered errors and fixes. Before we move on to language review etc, any feedback and comments regarding the contents would be much appreciated. Local version can be built using sphinx and viewed in your browser. |sphinx-build -b html . build/html/ ; firefox build/html/index.html| Thank you and kind regards, -- Jan Dobiášovský SQA CZ.NIC, z.s.p.o. Milešovská 1136/5 130 00 Praha 3