docs: fix typo, add gitignore, remove obsolet MANIFEST.in #417

Job	Run time
Tests on OS ubuntu-latest with Python 3.9 and JIT 0	12m 12s
Tests on OS ubuntu-latest with Python 3.9 and JIT 1	12m 35s
Tests on OS ubuntu-latest with Python 3.12 and JIT 0	19m 58s
Tests on OS ubuntu-latest with Python 3.12 and JIT 1	9m 44s
Tests on OS macos-latest with Python 3.9 and JIT 0	9m 27s
Tests on OS macos-latest with Python 3.9 and JIT 1	6m 15s
Tests on OS macos-latest with Python 3.12 and JIT 0	8m 18s
Tests on OS macos-latest with Python 3.12 and JIT 1	7m 39s
Tests on OS windows-latest with Python 3.9 and JIT 0	13m 27s
Tests on OS windows-latest with Python 3.9 and JIT 1	15m 19s
Tests on OS windows-latest with Python 3.12 and JIT 0	18m 5s
Tests on OS windows-latest with Python 3.12 and JIT 1	18m 9s
	2h 31m 8s

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