Update next-steps.md with a new YT tutorial series and some cleanup/changes #6399

Job	Run time
monorepo-lint	46s
get-build-packages	6s
get-lint-packages	6s
get-test-packages	6s
build (docs)	29s
build (eslint-plugin-isaacscript)	38s
build (isaac-lua-polyfill)	32s
lint (docs)	47s
build (isaac-typescript-definitions)	41s
lint (eslint-config-isaacscript)	35s
lint (eslint-plugin-isaacscript)	45s
lint (isaac-lua-polyfill)	42s
build (isaac-typescript-definitions-repentogon)	40s
lint (isaac-typescript-definitions)	46s
build (isaacscript-cli)	37s
lint (isaac-typescript-definitions-repentogon)	40s
build (isaacscript-common)	1m 1s
lint (isaacscript-cli)	43s
lint (isaacscript-common)	1m 20s
lint (isaacscript-spell)	36s
test (eslint-plugin-isaacscript)	40s
test (isaacscript-cli)	32s
Discord Failure Notification	4s
	13m 52s

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