add: use the nidm layercake for now
fix: spec page to use NIDM-Primer
NI-DM -> NIDM
NIDASH family -> NIDM family
NI-R data model -> NIDM-Results
NI-R -> NIDM-Results
NIDASH Results Data Model -> NIDM-Results
NIDM-R -> NIDM-Results
Remove mention of "Component 3"
fix: correct figure for "NIDM-Results as part of NIDM"
fix: delete quotes in example
NI- -> NIDM
nidash-family -> nidm-family
fix: use Respec identifiers to refer to figures
fix: remove sentence from PROV-DM
add overview figure
fix: remove sentence from PROV-DM
ni-r- -> nidmresults-
keep only a single UML chart for core structures
Keep only a single UML chart for SPM- and FSL-specfic core structures