update init scripts + README for `software.eessi.io` (+ drop 'pilot' terminology) #561

Job	Run time
eessi_container_script (help)	50s
eessi_container_script (listrepos_default)	50s
eessi_container_script (listrepos_custom)	52s
eessi_container_script (run)	1m 53s
eessi_container_script (shell)	1m 50s
eessi_container_script (container)	1m 35s
eessi_container_script (resume)	1m 30s
	9m 20s

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