docs: fix typo, add gitignore, remove obsolet MANIFEST.in #411

Job	Run time
Tests on OS ubuntu-latest with Python 3.9 and JIT 0	14m 37s
Tests on OS ubuntu-latest with Python 3.9 and JIT 1	15m 27s
Tests on OS ubuntu-latest with Python 3.12 and JIT 0	23m 3s
Tests on OS ubuntu-latest with Python 3.12 and JIT 1	16m 1s
Tests on OS macos-latest with Python 3.9 and JIT 0	11m 25s
Tests on OS macos-latest with Python 3.9 and JIT 1	12m 13s
Tests on OS macos-latest with Python 3.12 and JIT 0	8m 6s
Tests on OS macos-latest with Python 3.12 and JIT 1	18m 9s
Tests on OS windows-latest with Python 3.9 and JIT 0	18m 32s
Tests on OS windows-latest with Python 3.9 and JIT 1	15m 29s
Tests on OS windows-latest with Python 3.12 and JIT 0	32m 30s
Tests on OS windows-latest with Python 3.12 and JIT 1	20m 0s
	3h 25m 32s

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