update doc links and add easycozy known errors

docs/easycozy/known_errors.md

docs/ecolyo/functionalities/usage_events_tracking.md

docs/img/known_errors/oops_error.png

docs/img/known_errors/oops_error_1.png

docs/img/known_errors/oops_error_2.png

docs/konnectors/enedis.md

docs/konnectors/grdf.md

docs/proxy/description.md

mkdocs.yml