CI improvements: CodeClimate, Inch #9
Description
Context
Right now CodeCov is used for the test coverage tracking.
On the other side, CodeClimate provides both maintainability and coverage tracking.
Inch-ci provides documentation coverage badge.
Task
- add Inch-CI badge to READMEs
- we want maintainability badge from CodeClimate, but CC also has test coverage tracking. To reduce the number of tools used in CI - switch to CC as a test coverage tracker.
- add CC badges for maintainability and coverage