migrate docs to gitbook (#904) #3658

Job	Run time
code-quality	3m 49s
build (ubuntu-latest, 3.8, 1.10.15)	39m 44s
build (ubuntu-latest, 3.8, 2.7.1)	39m 57s
build (ubuntu-latest, 3.9, 1.10.15)	39m 26s
docs	4m 35s
build (ubuntu-latest, 3.9, 2.7.1)	39m 4s
licenses	47s
build (ubuntu-latest, 3.10, 1.10.15)	39m 58s
build (ubuntu-latest, 3.10, 2.7.1)	39m 57s
optional_dependencies (default)	54s
optional_dependencies (tensorflow)	1m 16s
build (ubuntu-latest, 3.11, 1.10.15)	39m 58s
build (ubuntu-latest, 3.11, 2.7.1)	39m 39s
optional_dependencies (torch)	1m 58s
build (windows-latest, 3.10, 1.10.15)	39m 53s
optional_dependencies (prophet)	54s
build (windows-latest, 3.10, 2.7.1)	39m 52s
optional_dependencies (keops)	1m 59s
optional_dependencies (all)	3m 12s
	6h 56m 52s

Provide feedback