fix: render README.rst at GitHub

[bednar]

Related #634

Proposed Changes

Removed unsupported text role :class:. For more info see https://docutils.sourceforge.io/docs/ref/rst/roles.html

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] pytest tests completes successfully
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d7181fa) 90.36% compared to head (ec07c24) 90.36%.

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #635 +/- ## ======================================= Coverage 90.36% 90.36% ======================================= Files 39 39 Lines 3497 3497 ======================================= Hits 3160 3160 Misses 337 337 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.