Move subdirectories from CTA dev repo into new repos

There are some subdirectories in the CTA repo which contain files of historical interest but which are not really part of the code base:

• CTA/migration contains the CASTOR to CTA migration scripts and tools. We have finished with this process. RAL still have to do their Facilities migration, otherwise no-one in the world needs these tools. Maybe of use to dCache/Fermi people as example code, as they will need to create a similar migration process for their tape metadata.
• CTA/LTO_RAO contains documents, data and scripts that were used for the RAO on LTO investigation. The results of the investigation have been incorporated into cta-taped, so the contents of this directory are for historical information only (like if we wanted to write a paper about this).
• CTA/doc contains some early CTA design documentation, plus some more recent papers and presentations, but it is not a comprehensive repository of all documentation.
• CTA/EOSCTATAPE contains 1 config file and some e-mails from 2017. Ask @vlado if these need to be kept. The e-mails for sure should not be part of the repo due to OC11.
• CTA/python: should this be moved to the cta-operations repo?

I propose that we move these subdirectories, with all of their git history intact, out of cta/CTA into new repos.

Then delete the subdirectories (including all their history) from the CTA repo. The history will be preserved in the new repo.

This thread on StackOverflow suggests how this could be accomplished.