Merge CI workflows into CI.yml, workflow_dispatch #2625

Job	Run time
PDF/LaTeX backend	3m 17s
NodeJS for prerender	1m 32s
CSS for HTML themes	39s
Julia 1.6 - ubuntu-latest - x64	3m 53s
Julia 1.6 - macos-latest - x64	7m 11s
Documentation: html	1m 17s
Julia 1.6 - windows-latest - x64	13m 49s
Linkcheck: online tests	2m 7s
Documentation: pdf	2m 46s
Julia 1 - ubuntu-latest - x64	3m 59s
Julia 1 - macos-latest - x64	7m 8s
Linkcheck: Documenter manual	8m 5s
Julia 1 - windows-latest - x64	5m 35s
Prettier (JS code formatting)	6s
Julia nightly - ubuntu-latest - x64	5m 58s
Julia nightly - macos-latest - x64	8m 35s
Runic (Julia code formatting)	47s
Julia nightly - windows-latest - x64	7m 5s
Julia 1 - ubuntu-latest - x86	5m 12s
Spell Check with Typos	7s
	1h 29m 8s

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