Issue 49999 - Finish up the transfer to React
Description: Move plugins.es6 to index.es6 so we can
properly navigate using old nav-bar. New React entry points
should be added to the index.es6.
Add a make target for manual Cockpit UI building:
'make 389-console' and a target to node_modules.mk 'eslint-fix'.
Fix a few CSS issues.
Reviewed by: mreynolds, mhonek (Thanks!)