Move documentation about OTB integration in QGIS to qgis documentation

What changes will be made and why they would make a better Orfeo ToolBox?

Move documentation about OTB configuration into qgis to qgis documentation website.

High level description

Following !713 (merged), The documentation about how to configure OTB for qgis must be moved to qgis documentation:

• for 3.10
• and for testing

through the specific github project branches release-3.10 and master.

Moreover we can complete the following pages:

• 3.10
• testing with a link to otb applications documentation with the cookbook.

We can keep some information into the otb cookbook but avoid duplication with qgis documentation. The main user oriented information must be in QGIS and the technical information must be put into OTB cookbook. A link to otb cookbook must be available into QGIS documentation and reciprocally into OTB documentation to qgis one.

Risks and benefits

More users for OTB into QGIS !

Alternatives for implementations

none

Who will be developing the proposed changes?

currently not defined