Update next-steps.md with a new YT tutorial series and some cleanup/changes #6405

Job	Run time
get-test-packages	3s
get-lint-packages	6s
get-build-packages	6s
monorepo-lint	1m 3s
test (eslint-plugin-isaacscript)	40s
test (isaacscript-cli)	28s
lint (docs)	44s
lint (eslint-config-isaacscript)	36s
lint (eslint-plugin-isaacscript)	47s
lint (isaac-lua-polyfill)	51s
lint (isaac-typescript-definitions)	49s
lint (isaac-typescript-definitions-repentogon)	45s
lint (isaacscript-cli)	46s
lint (isaacscript-common)	1m 19s
lint (isaacscript-spell)	33s
build (docs)	28s
build (eslint-plugin-isaacscript)	32s
build (isaac-lua-polyfill)	40s
build (isaac-typescript-definitions)	31s
build (isaac-typescript-definitions-repentogon)	31s
build (isaacscript-cli)	37s
build (isaacscript-common)	1m 0s
Discord Failure Notification	0s
	13m 55s

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