update training links from NeSI to REANNZ #1069
Description
At least this one is still linked to the NeSI page: https://docs.nesi.org.nz/Getting_Started/Getting_Help/Introductory_Material/
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At least this one is still linked to the NeSI page: https://docs.nesi.org.nz/Getting_Started/Getting_Help/Introductory_Material/