docs: fix typo, add gitignore, remove obsolet MANIFEST.in #413

Job	Run time
Tests on OS ubuntu-latest with Python 3.9 and JIT 0	12m 45s
Tests on OS ubuntu-latest with Python 3.9 and JIT 1	1m 46s
Tests on OS ubuntu-latest with Python 3.12 and JIT 0	14m 45s
Tests on OS ubuntu-latest with Python 3.12 and JIT 1	14m 45s
Tests on OS macos-latest with Python 3.9 and JIT 0	6m 57s
Tests on OS macos-latest with Python 3.9 and JIT 1	11s
Tests on OS macos-latest with Python 3.12 and JIT 0	14m 45s
Tests on OS macos-latest with Python 3.12 and JIT 1	6m 54s
Tests on OS windows-latest with Python 3.9 and JIT 0	14m 36s
Tests on OS windows-latest with Python 3.9 and JIT 1	14m 13s
Tests on OS windows-latest with Python 3.12 and JIT 0	14m 38s
Tests on OS windows-latest with Python 3.12 and JIT 1	14m 43s
	2h 10m 58s

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