Move pages to `src/pages` #1012

Job	Run time
publish (cli) / check	11s
publish (core) / check	7s
publish (plugin-tutorial) / check	7s
publish (core) / test	31m 30s
publish (core) / publish	0s
publish (plugin-tutorial) / test	23m 28s
publish (plugin-tutorial) / publish	0s
publish (cli) / test	23m 4s
publish (cli) / publish	0s
	1h 18m 27s

Provide feedback