Bump reveal.js from 4.6.1 to 5.0.2 in /csunplugged #1193

Job	Run time
Tests - Content	6m 57s
Tests - Documentation	33s
Tests - General	2m 54s
Tests - Django system check	1m 36s
Tests - Management	4m 47s
Tests - Resources	4m 17s
Tests - Style	3m 20s
Create static files	0s
Create resources	0s
Create resource thumbnails	0s
Create at a distance files	0s
Create and publish Docker image	0s
	24m 24s

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