docs: fix typo, add gitignore, remove obsolet MANIFEST.in #415

Job	Run time
Tests on OS ubuntu-latest with Python 3.9 and JIT 0	10m 23s
Tests on OS ubuntu-latest with Python 3.9 and JIT 1	11m 41s
Tests on OS ubuntu-latest with Python 3.12 and JIT 0	34m 52s
Tests on OS ubuntu-latest with Python 3.12 and JIT 1	13m 41s
Tests on OS macos-latest with Python 3.9 and JIT 0	9m 17s
Tests on OS macos-latest with Python 3.9 and JIT 1	15m 47s
Tests on OS macos-latest with Python 3.12 and JIT 0	7m 40s
Tests on OS macos-latest with Python 3.12 and JIT 1	11m 28s
Tests on OS windows-latest with Python 3.9 and JIT 0	31m 11s
Tests on OS windows-latest with Python 3.9 and JIT 1	25m 55s
Tests on OS windows-latest with Python 3.12 and JIT 0	25m 20s
Tests on OS windows-latest with Python 3.12 and JIT 1	23m 53s
	3h 41m 8s

Provide feedback