Rework first parts of the books and few words about taxation and products
Bootstrap payments and add state machine chapter
Add basic info about currencies
Simple docs about languages management
Initial documentation for pricing
Bootstrap simple docs for Addresses and Inventory
Few bits of orders documentation
Update configuration.rst
Merge pull request #159 from sjoerdsmink/patch-1

Update configuration.rst
Update installation.rst

missing ```:```
Merge pull request #160 from emgiezet/patch-1

Update installation.rst
Update installation.rst

Wrong template name.
Merge pull request #161 from emgiezet/patch-2

Update installation.rst