docs: spelling fixes
Squashed into 1 commit because I'm lazy:
- non-existant -> nonexistent
- accros -> across
- comptatibility -> compatibility
- requieres -> requires
- aliast -> alias
- unexistent -> nonexistent
- convertion -> conversion
- nto -> not
all: tutorials/tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico