clean-up the different documentations

[12rambau]

The documentation have been built in multiple places under multiple names.

• https://readthedocs.org/projects/gee-tools/ (should be removed)
• https://geetools.readthedocs.io/en/latest/ (should be the only one)

@fitoprincipe you are the only maintainer of "geetool" can you ad me as well (borntobealive) to the geetools RDT project ?

[12rambau]

I deleted the old documentation, only the geetools one remains.