Merge remote-tracking branch 'hoatle/tasks/20_release_process' into develop
update intro docs: add About Teracy section
DEV-30 | use nature theme for docs instead of default one
DEV-14 | define semantic versioning: update python part
Merge remote-tracking branch 'hoatle/tasks/14_define_software_semantic_versioning' into develop
DEV-20 | release process: update content