ci(publish): remove skip ci from commit

It prevents workflow runs for new tags.

fix: markupsafe error for NUT 3.3

Resolves #8

ci(docker-publish): optimize build and push conditions

ci: dropping ppc64le support

cryptography won't build anymore and it's a platform which probably nobody would use for NUT anyway

feat: added titledb update feature

feat: upgrade to NUT v3.3

Updated image for NUT 3.1 compatibility

Fixed links in README