Show traceback live in app when YAML parsing error (#29)

Improve the error messages of YAML validation (#28)

* Improve the error messages of YAML validation

* remove unused

Implement YAML focus validation and improve consistency (breaking YAM…

…L change) (#24)

* Implement YAML focus validation

* Implement changes

* Raise custom exception

* test

Add a TIP

Implement file watcher feature `--watch` (#18)

Merge pull request #16 from basnijholt/fix-image

Bump to textual-image[textual]>=0.7.0 and remove workaround

add more focus modes

Rename

Format