Move csim-lab page to plugins

It's really about a plugin suite by that group.
Ideally, there would be one page in orgs for the group itself,
and another in plugins focusing on the plugins. But the page
as written is definitely about a plugin suite.

Author: ctrueden

_pages/orgs/csim-lab.md _pages/plugins/csim-lab.md_pages/orgs/csim-lab.md renamed to _pages/plugins/csim-lab.md

@@ -466,7 +466,7 @@ COBA :: orgs/coba
 CPU_Meter :: plugins/cpu-meter
 CSBD :: orgs/csbd
 CSBDeep :: plugins/csbdeep
-CSIMLab :: orgs/csim-lab
+CSIMLab :: plugins/csim-lab
 Calc_dSpace :: plugins/calc-dspace
 Calculator_Plus :: plugins/calculator-plus
 Calibrate_SCANCO :: plugins/bonej#calibrate-scanco-wip