README: Mention new features

docs: Mention move of micropython directory

Merge pull request #70 from emlearn/makefile-dependencies

Improve makefile dependencies

Merge pull request #67 from emlearn/webassembly-improve

webassembly: Build pyscript variant

Merge remote-tracking branch 'origin/master' into HEAD

docs: Bump version

Merge pull request #55 from emlearn/tests-all-runner

tests: Improve running

docs: Move more into Sphinx, add external modules, mention MicroPytho…

…n 1.25

README: Update mentions of MicroPython to version 1.24

har_trees: Use temporary directory