docs(Advanced): Add Advanced/Migration/organisation-instructions-importation.md (refs #5177)

Moved documentation of `programs/*` commands/scripts from
`dynacase-doc-platform-operating-manual` to
`dynacase-doc-core-reference`.
fix(toc): Fix TOC (refs #5187)
Merge pull request #267 from eguaj/3.2-A5177

docs(Advanced): Add Advanced/Migration/organisation-instructions-importation.md (closes #5177)(closes #5187)