[#24] new structure for FLOW App 2.0

copied existing material from 1.5
[#24] Update phone requirements
[#24] Update installation steps

* Add new screenshots
* Update phone setup
[#24] Delete unused files

* Legacy files and folders removal
[#24] Split Installation and Preparation Steps
[#24] Update preparation,installation,setup steps
[#24] Add Projects and Data Points draft
[#24] Updates 2.0 docs
[#24] Use 'form' instead of 'survey'
[#24] Fix old app version
[#24] Add questions information
[#24] Update screenshots
[#24] Dashboard doc changes
Merge branch 'docs-24' of https://github.com/akvo/akvo-flow-docs into docs-24
[#24] Dashboard doc changes
[#24] Dashboard doc and app doc changes
[#24] Add APN setup screenshots
[#24] Update references

* Use 'data point' (lowercase)
[#24] Add beta status warning

* Fix note
[#24] Update casing